The invention is generally related to encoded information reading (EIR) terminals and is specifically related to EIR terminals including radio-frequency identification (RFID) reading devices.
RFID methods are widely used in a number of applications, including smart cards, item tracking in manufacturing, inventory management in retail, etc. An RFID tag can be attached, e.g., to an inventory item. An EIR terminal can be configured to read the memory of an RFID tag attached to an inventory item.
In one embodiment, there is provided a portable radio-frequency identifier (RFID) reading terminal comprising a microprocessor, a memory, an RFID reading device, and a display. The portable EIR terminal can be configured, responsive to successfully reading a plurality of RFID tags attached to a plurality of items sustained by a physical structure, to group the plurality of read RFID tags into zero or more clusters, by correlating quantities of RFID tags read within several time periods to spatial positions of the coverage shapes of the RF signals transmitted by the RFID reading device during the several time periods. The EIR terminal can be further configured to determine the spatial positions of the RFID signal coverage shapes based on the spatial positions and orientations of the portable EIR terminal during the several time periods. The EIR terminal can be further configured to display a quantity of RFID tags within each cluster overlaid over an image of the physical structure, with a visual reference to a fragment of the physical structure corresponding to the spatial positions of the RFID tags comprised by each cluster.
In one embodiment, the portable EIR terminal can be further configured to display a scan trace overlaid over the image of the physical structure. The scan trace can be provided by a line comprising a plurality of time varying points, each point being defined by a projection onto a chosen plane at a given moment in time of the coverage shape of the RF signal transmitted by the RFID reading device.
In one embodiment, the portable EIR terminal can further comprise a two-dimensional imager, and can be further configured to determine the spatial position of the RF signal coverage shape based on the position and orientation of the RF antenna relatively to the position of the field of view of the two-dimensional imager.
In one embodiment, the portable EIR terminal can further comprise a motion sensing device, and can be further configured to determine a change of the spatial position and orientation of the RF signal coverage shape based on the motion sensing data received from the motion sensing device. In a further aspect, the motion sensing device can comprise three or more accelerometers configured to measure proper acceleration values of the EIR terminal along three mutually perpendicular axes.
In one embodiment, the portable EIR terminal can be further configured to receive an image of the physical structure from an external computer.
In one embodiment, the portable EIR terminal can be further configured to receive a description of a physical structure, and can be further configured to create an image of the physical structure based on the description.
In one embodiment, the portable EIR terminal can further comprise a two-dimensional imager, and can be further configured to acquire an image of the physical structure using the two-dimensional imager.
In one embodiment, the portable EIR terminal can be further configured to transmit a list of read RFID tags, a count of read RFID tags, a count of clusters of RFID tag bearing items, a list of items in each cluster, and/or a list of locations of clusters to an external computer.
For the purpose of illustrating the invention, the drawings show aspects of one or more embodiments of the invention. However, it should be understood that the present invention is not limited to the precise arrangements and instrumentalities shown in the drawings, wherein:
The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the drawings, like numerals are used to indicate like parts throughout the various views.
RFID reading devices usually offer improved efficiency over barcode scanning devices for retail inventory, by being capable of reading multiple RFID tags that are within range of the RF signal transmitted by an RFID reading device. A downside to this multiple-read capability is lack of scanned items localization, due to insufficient correlation between where the RFID reader is located or oriented, and the RFID tags being read. Retail inventory management typically requires more than 90% of the RFID tags present in a department to be successfully acquired during the inventory process. When this high accuracy is not achieved, it is necessary to rescan the entire department, since the locations of any unread RFID tags are unknown.
Item tracking and/or inventory control can be implemented by placing an RFID tag on each inventory item. The EIR terminal can comprise at least one RFID reading device which can be configured to read and/or modify a memory of an RFID tag containing an encoded message. The RFID reading device can transmit and/or receive radio frequency (RF) signals to and from RFID tags attached to inventory items. Each RFID tag can store the tag identifier in its memory. An RFID tag attached to an inventory item can further store in the tag's memory a product code of the item, an EPC (Electronic Product Code) of the item, and/or at least one alphanumeric string identifying the item.
The RFID reading device can be further configured to output decoded message data corresponding to the encoded message, e.g., decoded message data containing identifiers of the items to which the RFID tags are attached. The EIR terminal can be configured to store in its memory and/or transmit to an external computer the item identifiers received from the plurality of RFID tags.
The EIR terminal can read RFID tags from a range of distances and various terminal orientations with respect to an RFID tag being read. To further improve the reliability of scanning operations and the terminal's operator experience, the EIR terminal can be configured to display the quantity of successfully read RFID tags overlaid over an image of a physical structure (e.g., a shelving unit) sustaining the items bearing the RFID tags (e.g., inventory items at a manufacturing, retail or a storage facility). In a further aspect, the portable EIR terminal can be configured to group a plurality of successfully read RFID tags into zero or more clusters, and display the quantities of RFID tags within each cluster with a visual reference to a fragment of the physical structure sustaining items bearing the RFID tags comprised by each cluster, as schematically shown in
Such a capability provides increased operational efficiency of RFID tag reading for retail inventory management. Various embodiments of the EIR terminal can be used in a numerous applications, including but not limited to, item tracking in manufacturing, storage, and retail, real-time inventory control systems, etc.
As described in the commonly assigned U.S. patent application Ser. No. 13/359,005 entitled “Portable RFID Reading Terminal with Visual Indication of Scan Trace” filed on Jan. 26, 2012, which is incorporated herein by reference in its entirety, an EIR terminal can be configured to receive an expected count of inventory items or an expected inventory list of items of interest stored within a storage, manufacturing, and/or retail facility. The EIR terminal can be further configured to reconcile the inventory of items stored within a storage, manufacturing, and/or retail facility against the expected count of inventory items or the expected inventory list by reading the RFID tags attached to the inventory items. As used herein, “inventory list” shall refer to a collection of item descriptions, each item description comprising at least the item identifier.
As described in the commonly assigned U.S. patent application Ser. No. 13/452,133, entitled “System and Method for Calibration and Mapping of Real-Time Location Data” filed concurrently herewith, which is incorporated herein by reference in its entirety, an EIR terminal configured to read RFID tags can be augmented with an imaging device, positioning package, including but not limited to, a 3-axis (3 dimensional) accelerometer package, and a 9-DOF (degree of freedom) IMU (Inertial Measurement Unit) containing a 3-axis accelerometer, a 3-axis magnetometer, and 3-axis gyroscope sensors, to acquire movement and position calibration data regarding the motion of the EIR terminal.
At any moment in time, the RF signal coverage emitted by an EIR terminal can be defined by a 3D shape, as schematically shown in
At any given moment in time, a target scan area by an EIR terminal can be visualized as a projection 2040 of the 3D RF signal coverage shape 2020 onto an arbitrarily chosen plane 2050, including an imaginary plane. In one embodiment, the EIR terminal can be further configured to display a visual scan trace overlaid over an image of the physical structure (e.g., a shelving unit) sustaining a plurality of items bearing RFID tags (e.g., retail items). For a moving EIR terminal, the visual scan trace can be provided by a line defined by a multitude of time varying points, each point being a projection 2040 of the 3D RF signal coverage shape 2020 onto the arbitrarily chosen plane 2050 at a given moment in time. In a further aspect, the imaginary plane onto which the visual scan trace is projected can be chosen to intersect a physical structure (e.g., a shelf) containing the inventory items, and thus the scan trace can be overlaid over an image of the physical structure.
Component-level diagram of one embodiment of the EIR terminal is now being described with references to
EIR terminal 100 can further comprise a communication interface 340 communicatively coupled to the system bus 370. In one embodiment, the communication interface can be provided by a wireless communication interface. The communication interface can be configured to support, for example, but not limited to, the following protocols: at least one protocol of the IEEE 802.3/IEEE 802.11/802.15/802.16 protocol family, at least one protocol of the HSPA/GSM/GPRS/EDGE protocol family, TDMA protocol, UMTS protocol, LTE protocol, and/or at least one protocol of the CDMA/1×EV-DO protocol family.
EIR terminal 100 can further comprise a battery 356. In one embodiment, the battery 356 can be provided by a replaceable rechargeable battery pack. The EIR terminal 100 can further comprise a GPS receiver 380. The EIR terminal 100 can further comprise at least one connector 390 configured to receive a subscriber identity module (SIM) card.
The EIR terminal 100 can further comprise an imaging device 330, provided, for example, by a two-dimensional imager. The EIR terminal 100 can further comprise a motion sensing device 354.
The EIR terminal 100 can further comprise an RFID reading device 333. In one embodiment, the RFID reading device 333 can be configured to read a memory of an RFID tag containing an encoded message and to output raw message data containing the encoded message. In another embodiment, the RFID reading device 333 can be configured to read a memory of an RFID tag containing an encoded message and to output decoded message data corresponding to the encoded message. As used herein, “message” is intended to denote a bit sequence or a character string comprising alphanumeric and/or non-alphanumeric characters. An encoded message can be used to convey information, such as identification of the source and the model of an item, for example, in an EPC code.
In one embodiment, the EIR terminal 100 can further comprise a graphical user interface including a display adapter 175 and a keyboard 179. In one embodiment, the EIR terminal 100 can further comprise an audio output device, e.g., a speaker 181.
It is not necessary that a device's primary function involve reading RFID tags in order to be considered an EIR terminal; for example, a cellular telephone, a smart phone, a PDA, or other portable computing device that is capable of reading RFID tags can be referred to as an EIR terminal for purposes of this disclosure.
In a further aspect, the EIR terminal can be incorporated in a data collection system. One embodiment of the data collection system, schematically shown in
An EIR terminal 100a-100z can establish a communication session with an external computer 171. In one embodiment, network frames can be exchanged by the EIR terminals 100a-100z and the external computer 171 via one or more routers 140, access points 135, and other infrastructure elements. In another embodiment, the external computer 171 can be reachable by the EIR terminal 100m via a local area network (LAN). In a yet another embodiment, the external computer 171 can be reachable by the EIR terminal 100 via a wide area network (WAN). In a yet another embodiment, the external computer 171 can be reachable by the EIR terminal 100 directly (e.g., via a wired or wireless interface). A skilled artisan would appreciate the fact that other methods of providing interconnectivity between the EIR terminal 100 and the external computer 171 relying upon LANs, WANs, virtual private networks (VPNs), and/or other types of network are within the scope of this disclosure.
A “computer” herein shall refer to a programmable device for data processing and control, including a central processing unit (CPU), a memory, and at least one communication interface. For example, in one embodiment, a computer can be provided by a server running a single instance of a multi-tasking operating system. In another embodiment, a computer can be provided by a virtual server, i.e., an isolated instance of a guest operating system running within a host operating system. A “network” herein shall refer to a set of hardware and software components implementing a plurality of communication channels between two or more computers. A network can be provided, e.g., by a local area network (LAN), or a wide area network (WAN). While different networks can be designated herein, it is recognized that a single network as seen from the application layer interface to the network layer of the OSI model can comprise a plurality of lower layer networks, i.e., what can be regarded as a single Internet Protocol (IP) network, can include a plurality of different physical networks.
The communications between the EIR terminal 100 and the external computer 171 can comprise a series of requests and responses transmitted over one or more TCP connections. A skilled artisan would appreciate the fact that using various transport and application level protocols is within the scope and the spirit of the invention.
In one embodiment, at least one of the messages transmitted by the EIR terminal 100 can include decoded message data corresponding to an RFID label attached to an inventory item. For example, an EIR terminal can transmit a request to the external computer to retrieve product information corresponding to a product identifier encoded by an RFID tag attached to a retail item, or to transmit an item tacking record for an item identified by an RFID tag attached to the item.
As noted herein supra, the EIR terminal 100 can be configured to receive from the external computer 171 information including, but not limited to an inventory list containing item identifiers, or count, of items stored within a storage, manufacturing, and/or retail facility. The inventory list or count can further contain storage location information of specific items. The EIR terminal 100 can be further configured to transmit to the external computer 171 information including, but not limited to a list of read RFID tags, a count of read RFID tags, a count of clusters of RFID tag bearing items, a list of items in each cluster, and/or a list of locations of clusters.
In one embodiment, the EIR terminal 100 can be configured to receive from the external computer 171 one or more images of physical structures sustaining inventory items bearing RFID tags. An image can be provided, for example, by a photographical image or by a rendered outline.
As noted herein supra, the EIR terminal 100 can be configured, responsive to successfully reading a plurality of RFID tags attached to a plurality of items sustained by a physical structure, to group the RFID tags into zero or more clusters, and display a quantity of RFID tags within each cluster overlaid over an image of the physical structure, with a visual reference to a fragment of the visual structure corresponding to spatial positions of the RFID tags comprised by each cluster.
In a further aspect, the EIR terminal can be configured to store in its memory the identifiers of successfully read RFID tags together with timestamps of the read events. The EIR terminal can use the stored information to correlate quantities of RFID tags read within several time periods to spatial positions of the coverage shapes of the RFID signals transmitted by the RFID reading device. Based on the correlation, the EIR terminal can group the RFID tags into several clusters, as schematically shown in
In a further aspect, the EIR terminal can be configured to determine the spatial positions of the RFID signal coverage shapes based on spatial positions and orientations of the terminal during the several time periods.
In a further aspect, the EIR terminal can be configured to display the quantities of RFID tags within each cluster overlaid over an image of the physical structure, with a visual reference to a fragment of the physical structure (e.g., a shelf of a shelving unit) corresponding to spatial positions of the RFID tags comprised by each cluster.
In one embodiment, the EIR terminal can comprise a two-dimensional imager. The EIR terminal can be configured to determine a spatial position of the RF signal coverage shape based on the known position and orientation of the RF antenna relatively to the position of the field of view (FOV) of the two-dimensional imager, as schematically shown in
As noted herein supra, at any given moment in time, a target scan area by an EIR terminal can be visualized as a projection 2040 of the 3D RF signal coverage shape 2020 onto an arbitrarily chosen plane 2050, including an imaginary plane. The plane 2050 can represent an arbitrary chosen plane, e.g., a plane intersecting a physical structure hosting one or more inventory items. The RF antenna can be oriented relatively to the view finder in such a way that the central axis 5010 of the field of view of the imager would be parallel to the central axis 5020 of the RF signal coverage shape by the antenna. Reducing the distance between the EIR terminal and the plane 2050 and/or increasing the RF transmit power level results in a larger projection of the RF signal coverage area onto the plane 5020, as schematically shown in
Based on the expected shape of the signal coverage and the distance and orientation of the RF antenna to a physical structure (e.g., depicted as plane 2050 in
In another embodiment, the EIR terminal can comprise a motion sensing device and can be configured to determine the change of the spatial position and orientation of the RF signal coverage shape based on the motion sensing data received from the motion sensing device. In one illustrative embodiment, the motion sensing device can comprise three or more accelerometers configured to measure proper acceleration values of the EIR terminal along three mutually perpendicular axes.
As noted herein supra, in one embodiment, the EIR terminal 100 can be further configured to display the quantities of RFID tags by cluster and/or a scan trace overlaid over an image of a physical structure (e.g., a shelf) containing one or more scanned items and possibly one or more items yet to be scanned. In one embodiment, the image of the physical structure containing the inventory items can be received by the EIR terminal 100 over the network from an external computer 171. In another embodiment, the EIR terminal 100 can comprise a two-dimensional imager, and the image of the physical structure containing the inventory items can be acquired by the two-dimensional imager. In another embodiment, the image of the physical structure is drawn, with appropriate detail, on the EIR terminal display, based on a description of the physical structure received by the terminal 100 via the user interface, from an external peripheral device or from an external computer.
In a further aspect, RFID reading device 333 can be compliant with EPC™ Class-1 Generation-2 UHF RFID Protocol for Communications at 860 MHz-960 MHz by EPCglobal, commonly known as the “Gen 2” standard, which defines physical and logical requirements for a passive-backscatter, interrogator-talks-first (ITF) RFID system operating in the 860 MHz-960 MHz frequency range.
In one embodiment, EIR terminal 100 can transmit information to a passive RFID tag by modulating an RF signal in the 860-960 MHz frequency range. An RFID tag can receive both information and operating energy from the RF signal transmitted by the EIR terminal 100. EIR terminal 100 can receive information from the RFID tag by transmitting a continuous-wave (CW) RF signal to the RFID tag. “Continuous wave” can refer to any waveform transmitted by an RFID reading device and suitable to power a passive RFID tag, e.g., a sinusoid at a given frequency. The RFID tag can respond by modulating the reflection coefficient of its antenna, thus backscattering an information signal to the EIR terminal 100. In one embodiment, the RFID tag can modulate the reflection coefficient of its antenna only responsive to receiving an RFID signal from EIR terminal 100.
In a further aspect, EIR terminal 100 can be configured to send information to one or more RFID tags by modulating an RF carrier using double-sideband amplitude shift keying (DSB-ASK), single-sideband amplitude shift keying (DSB-ASK), or phase-reversal amplitude shift-keying (PR-ASK) using a pulse-interval encoding (PIE) format. RFID tags can receive their operating energy from the same modulated RF carrier.
The EIR terminal 100 can be configured to receive information from an RFID tag by transmitting an unmodulated RF carrier and listening for a backscatter reply. RFID tags can transmit information by backscatter-modulating the amplitude and/or phase of the RFID carrier. RFID tags can encode the backscattered data using, e.g., FM0 baseband or Miller modulation of a subcarrier at the data rate. The encoding method to be employed by an RFID tag can be selected by the EIR terminal 100.
In another aspect, EIR terminal can establish one or more sessions with one or more RFID tags. An RFID tag can support at least one session-dependent flag for every session. The session-dependent flag can have two states. An RFID tag can invert a session-dependent flag responsive to receiving a command from EIR terminal 100. Tag resources other than session-dependent flags can be shared among sessions. In another aspect, an RFID tag can support a selected status flag indicating that the tag was selected by the EIR terminal 100.
Responsive to receiving an interrogation signal transmitted by the EIR terminal 100, an RFID tag can transmit a response signal back to EIR terminal 100. The response signal can contain useful data, e.g., an Electronic Product Code (EPC) identifier, or a tag identifier (TID). The response signal can include a representation of a binary string, at least part of which is equal to at least part one of the specified one or more target item identifiers.
In one embodiment, EIR terminal can implement EPC™ Class-1 Generation-2 UHF RFID Protocol for Communications at 860 MHz-960 MHz by EPCglobal. The EIR terminal 100 can interrogate RFID tags using the commands described herein infra.
Select command can be used by the EIR terminal 100 to select a particular RFID tag population for the subsequent inventory round. Select command can be applied successively to select a particular tag population based on user-specified criteria. Select command can include the following parameters:
Inventory command set can be used by the EIR terminal 100 to single out one or more individual tags from a group of RFID tags. A tag can maintain up to four simultaneous sessions and a binary Inventoried flag for each session. Inventory command set includes the following commands:
An RFID tag can implement a state machine. Once energized, a tag can change its current state to Ready. A selected tag can, responsive to receiving Query command, select a random integer from the range of [0; 2Q-1]. If the value of zero is selected, the tag can transition to Reply state, backscattering a 16-bit random number. If a non-zero value is selected, the tag can load the selected random integer into its slot counter and change its state to Arbitrate.
Responsive to receiving the tag transmission, EIR terminal can acknowledge it with Ack command containing the same random number. Responsive to receiving Ack command, the tag can change its state to Acknowledged and backscatter its protocol control (PC) bits, EPC and cyclic redundancy check (CRC) value. Unacknowledged tag can select a new random integer from the range of [0; 2Q-1], load the value into its slot counter, and change its state to Arbitrate. Responsive to receiving QueryAdjust command, a tag in the Arbitrate state should decrement the value of its slot counter and backscatter its protocol control (PC) bits, EPC and CRC value if its slot counter is equal to zero.
Responsive to receiving the tag's transmission of its PC, EPC and 16-bit CRC value, EIR terminal can send a QueryAdjust command causing the tag to invert its Inventoried flag and to transition to Ready state.
Access command set can be used by the EIR terminal 100 for communicating with (reading from and writing to) a tag. An individual tag must be uniquely identified prior to access. Access command set includes the following commands:
ReqRn command can be used by the EIR terminal 100 to request a handle from a tag; the handle can be used in the subsequent Access command set commands. Responsive to receiving Req_RN commands, a tag returns a 16-bit random integer (handle) and transitions from Acknowledged to Open or Secured state.
Read command can be used by the EIR terminal 100 to read tag's Reserved, EPC, TID and User memory;
Write command can be used by the EIR terminal 100 to write to tag's Reserved, EPC, TID and User memory;
Kill command can be used by the EIR terminal 100 to permanently disable a tag;
Lock command can be used by the EIR terminal 100 to lock passwords preventing subsequent read or write operations; lock individual memory banks preventing subsequent write operations; permanently lock the lock status of passwords or memory banks;
Access command can be used by the EIR terminal 100 to cause a tag having a non-zero access password to transition from Open to Secured state.
A skilled artisan would appreciate the fact that other methods of interrogating RFID tags by the EIR terminal 100 are within the scope of this disclosure.
One embodiment of the EIR terminal 100 is schematically shown in
While the present invention has been particularly shown and described with reference to certain exemplary embodiments, it will be understood by one skilled in the art that various changes in detail may be affected therein without departing from the spirit and scope of the invention as defined by claims that can be supported by the written description and drawings. Further, where exemplary embodiments are described with reference to a certain number of elements it will be understood that the exemplary embodiments can be practiced utilizing less than the certain number of elements.
A portable radio-frequency identifier (RFID) reading terminal can comprise a microprocessor, a memory, an RFID reading device, and a display. The portable EIR terminal can be configured, responsive to successfully reading a plurality of RFID tags attached to a plurality of items sustained by a physical structure, to group the plurality of read RFID tags into zero or more clusters, by correlating quantities of RFID tags read within several time periods to spatial positions of the coverage shapes of the RF signals transmitted by the RFID reading device during the several time periods. The EIR terminal can be further configured to determine the spatial positions of the RFID signal coverage shapes based on the spatial positions and orientations of the portable EIR terminal during the several time periods. The EIR terminal can be further configured to display a quantity of RFID tags within each cluster overlaid over an image of the physical structure, with a visual reference to a fragment of the physical structure corresponding to the spatial positions of the RFID tags comprised by each cluster.
A small sample of systems, methods, and apparata that are described herein is as follows:
A1. A portable radio-frequency identifier (RFID) reading terminal comprising:
a microprocessor;
a memory;
an RFID reading device;
a display;
wherein said portable EIR terminal is configured, responsive to successfully reading a plurality of RFID tags attached to a plurality of items sustained by a physical structure, to group said plurality of read RFID tags into zero or more clusters, by correlating quantities of RFID tags read within several time periods to spatial positions of coverage shapes of RF signals transmitted by said RFID reading device during said several time periods, said spatial positions of said coverage shapes of said RFID signals determined based on spatial positions and orientations of said portable EIR terminal during said several time periods;
wherein said portable EIR terminal is further configured to display a quantity of RFID tags within each cluster overlaid over an image of said physical structure, with a visual reference to a fragment of said physical structure corresponding to spatial positions of one or more RFID tags comprised by each cluster.
A2. The portable EIR terminal of (A1), further configured to display a scan trace overlaid over said image of said physical structure;
wherein said scan trace is provided by a line comprising a plurality of time varying points, each point being defined by a projection onto a chosen plane at a given moment in time of said coverage shape of said RF signal transmitted by said RFID reading device.
A3. The portable EIR terminal of (A1), further comprising a two-dimensional imager;
wherein said portable EIR terminal is further configured to determine a spatial position of said RF signal coverage shape based on a position and orientation of said RF antenna relatively to a position of a field of view of said two-dimensional imager.
A4. The portable EIR terminal of (A1), further comprising a motion sensing device;
wherein said portable EIR terminal is further configured to determine a change of a spatial position and orientation of said RF signal coverage shape based on motion sensing data received from said motion sensing device.
A5. The portable EIR terminal of (A1), further comprising a motion sensing device;
wherein said motion sensing device comprises three or more accelerometers configured to measure proper acceleration values of said EIR terminal along three mutually perpendicular axes.
A6. The portable EIR terminal of (A1), further configured to receive an image of said physical structure from an external computer.
A7. The portable EIR terminal of (A1), further configured to receive a description of a physical structure;
wherein said portable EIR terminal is further configured to create an image of said physical structure based on said description.
A8. The portable EIR terminal of (A1), further comprising a two-dimensional imager;
wherein said portable EIR terminal is further configured to acquire an image of said physical structure using said two-dimensional imager.
A9. The portable EIR terminal of (A1), further configured to transmit to an external computer at least one of: a list of read RFID tags, a count of read RFID tags, a count of clusters of RFID tag bearing items, a list of items in each cluster, and/or a list of locations of clusters to an external computer.
This is a Continuation of application Ser. No. 13/451,761 filed Apr. 20, 2012. The disclosure of the prior application is hereby incorporated by reference herein in its entirety.
Number | Name | Date | Kind |
---|---|---|---|
4673932 | Ekchian et al. | Jun 1987 | A |
6659344 | Otto et al. | Dec 2003 | B2 |
7003138 | Wilson | Feb 2006 | B2 |
7015967 | Kochi et al. | Mar 2006 | B1 |
7237721 | Bilcu et al. | Jul 2007 | B2 |
7308158 | Herbert et al. | Dec 2007 | B2 |
7405662 | Steinke et al. | Jul 2008 | B2 |
7407096 | McQueen et al. | Aug 2008 | B2 |
7494063 | Kotlarsky et al. | Feb 2009 | B2 |
7501950 | Suzuki | Mar 2009 | B2 |
7508306 | Fujii et al. | Mar 2009 | B2 |
7535361 | Doan et al. | May 2009 | B2 |
7551090 | Doan et al. | Jun 2009 | B2 |
7583178 | Hougen et al. | Sep 2009 | B2 |
7602288 | Broussard | Oct 2009 | B2 |
7627191 | Xu et al. | Dec 2009 | B2 |
7677602 | Bennett et al. | Mar 2010 | B2 |
7696874 | Stevens | Apr 2010 | B2 |
7702187 | Rusman et al. | Apr 2010 | B2 |
7708205 | Kotlarsky et al. | May 2010 | B2 |
7735731 | Skaaksrud et al. | Jun 2010 | B2 |
7756292 | Lev | Jul 2010 | B2 |
7756319 | Odell | Jul 2010 | B2 |
7786865 | Park | Aug 2010 | B2 |
7786925 | Knibbe et al. | Aug 2010 | B1 |
7815121 | Kotlarsky et al. | Oct 2010 | B2 |
7821400 | Tabet et al. | Oct 2010 | B2 |
7831082 | Holsing et al. | Nov 2010 | B2 |
7855643 | Tuttle | Dec 2010 | B2 |
7870999 | Skaaksrud et al. | Jan 2011 | B2 |
7883013 | Skaaksrud et al. | Feb 2011 | B2 |
7886972 | Skaaksrud et al. | Feb 2011 | B2 |
7951003 | Russell et al. | May 2011 | B2 |
7961908 | Tzur et al. | Jun 2011 | B2 |
7965186 | Downie et al. | Jun 2011 | B2 |
8115601 | Nonaka | Feb 2012 | B2 |
8149094 | Deoalikar et al. | Apr 2012 | B2 |
8727225 | Zumsteg et al. | May 2014 | B2 |
8881982 | Zumsteg et al. | Nov 2014 | B2 |
9013275 | Zumsteg | Apr 2015 | B2 |
9041518 | Vargas et al. | May 2015 | B2 |
9064254 | Todeschini et al. | Jun 2015 | B2 |
9092683 | Koziol et al. | Jul 2015 | B2 |
20020165758 | Hind et al. | Nov 2002 | A1 |
20030135433 | Yan | Jul 2003 | A1 |
20050212676 | Steinberg | Sep 2005 | A1 |
20050212817 | Cannon et al. | Sep 2005 | A1 |
20060022814 | Nogami | Feb 2006 | A1 |
20060187027 | Smith | Aug 2006 | A1 |
20060208859 | Hougen | Sep 2006 | A1 |
20060262961 | Noising et al. | Nov 2006 | A1 |
20060266836 | Bilcu et al. | Nov 2006 | A1 |
20070008136 | Suzuki | Jan 2007 | A1 |
20070063817 | Cherry | Mar 2007 | A1 |
20070102506 | Stevens | May 2007 | A1 |
20070199995 | Kotlarsky et al. | Aug 2007 | A1 |
20070215706 | Kotlarsky et al. | Sep 2007 | A1 |
20080037899 | Xu et al. | Feb 2008 | A1 |
20080061937 | Park | Mar 2008 | A1 |
20080111661 | Lin et al. | May 2008 | A1 |
20080164313 | Kotlarsky et al. | Jul 2008 | A1 |
20080164317 | Kotlarsky et al. | Jul 2008 | A1 |
20080169343 | Skaaksrud et al. | Jul 2008 | A1 |
20080172303 | Skaaksrud et al. | Jul 2008 | A1 |
20080173706 | Skaaksrud et al. | Jul 2008 | A1 |
20080173710 | Skaaksrud et al. | Jul 2008 | A1 |
20080203147 | Skaaksrud et al. | Aug 2008 | A1 |
20080203166 | Skaaksrud et al. | Aug 2008 | A1 |
20080210749 | Skaaksrud et al. | Sep 2008 | A1 |
20080210750 | Skaaksrud et al. | Sep 2008 | A1 |
20080224870 | Yeo et al. | Sep 2008 | A1 |
20080249899 | Nasser | Oct 2008 | A1 |
20080285091 | Skaaksrud et al. | Nov 2008 | A1 |
20090021353 | Nonaka | Jan 2009 | A1 |
20090040025 | Volpi et al. | Feb 2009 | A1 |
20090045913 | Nelson et al. | Feb 2009 | A1 |
20090045924 | Roberts, Sr. et al. | Feb 2009 | A1 |
20090121025 | Romanchik | May 2009 | A1 |
20090160638 | Jesme | Jun 2009 | A1 |
20090161964 | Tzur et al. | Jun 2009 | A1 |
20090243801 | Strzelczyk | Oct 2009 | A1 |
20090245755 | Lee et al. | Oct 2009 | A1 |
20090322537 | Tapp et al. | Dec 2009 | A1 |
20100010984 | Matias | Jan 2010 | A1 |
20100045436 | Rinkes | Feb 2010 | A1 |
20100073487 | Sogoh et al. | Mar 2010 | A1 |
20100109903 | Carrick | May 2010 | A1 |
20100142825 | Maxwell et al. | Jun 2010 | A1 |
20100148985 | Lin et al. | Jun 2010 | A1 |
20100201488 | Stern et al. | Aug 2010 | A1 |
20100201520 | Stern et al. | Aug 2010 | A1 |
20100220894 | Ackley et al. | Sep 2010 | A1 |
20100226530 | Lev | Sep 2010 | A1 |
20100232712 | Tomita et al. | Sep 2010 | A1 |
20100252621 | Ito et al. | Oct 2010 | A1 |
20100271187 | Uysal et al. | Oct 2010 | A1 |
20100296753 | Ito et al. | Nov 2010 | A1 |
20100303348 | Tolliver et al. | Dec 2010 | A1 |
20100308964 | Ackley et al. | Dec 2010 | A1 |
20110052008 | Holsing et al. | Mar 2011 | A1 |
20110084808 | Tuttle | Apr 2011 | A1 |
20110115947 | Oh | May 2011 | A1 |
20110128125 | Kai et al. | Jun 2011 | A1 |
20110143811 | Rodriguez | Jun 2011 | A1 |
20110205387 | Tzur et al. | Aug 2011 | A1 |
20110212717 | Rhoads et al. | Sep 2011 | A1 |
20110280447 | Conwell | Nov 2011 | A1 |
20110284625 | Smith et al. | Nov 2011 | A1 |
20110290883 | Kotlarsky et al. | Dec 2011 | A1 |
20130194077 | Vargas et al. | Aug 2013 | A1 |
20130277427 | Zumsteg et al. | Oct 2013 | A1 |
20130277430 | Zumsteg et al. | Oct 2013 | A1 |
20130278386 | Zumsteg | Oct 2013 | A1 |
20130306720 | Todeschini et al. | Nov 2013 | A1 |
20140014724 | Koziol et al. | Jan 2014 | A1 |
Entry |
---|
EPC Global; Specification for RFID Air Interface, EPC Radio-Frequency Indentity Protocols Class-1 Generation-2 UHF RFID Protocol for Communications at 860 MHz-960 MHz; Version 1.0.9; Jan. 31, 2005; pp. 1-94. |
Number | Date | Country | |
---|---|---|---|
20160267300 A1 | Sep 2016 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 13451761 | Apr 2012 | US |
Child | 15160342 | US |