An aspect of the present disclosure relates to a cleaning tool, such as a rotatable scrubbing member, for use in cleaning machines, such as mobile floor cleaners, and more particularly to a rotating scrubbing member incorporating electrodes of an electrolysis cell.
Floor cleaning in public, commercial, institutional and industrial buildings have led to the development of various specialized floor cleaning machines, such as hard and soft floor cleaning machines. These cleaning machines generally utilize a cleaning liquid dispensing system and a cleaning head to perform a floor cleaning operation.
The cleaning liquid dispensing system generally dispenses a cleaning liquid that includes water and a chemically based detergent. The detergent typically includes a solvent, a builder, and a surfactant. The cleaning head typically includes one or more disc-type scrubbing brushes, which may be located in front of, under or behind the floor cleaning machine. The scrubbing brushes typically include nylon bristles, pads or other fibers. The scrubbing brushes are motorized to rotate during cleaning operations. The rotation of the scrubbing brushes causes the brushes to scrub the surface being cleaned as they engage the surface.
While detergents increase cleaning effectiveness for a variety of different soil types, such as dirt and oils, these detergents also have a tendency to leave unwanted residue on the cleaned surface. Such residue can adversely affect the appearance of the surface and the tendency of the surface to re-soil. Additionally, the detergents may not be environmentally friendly. Some mobile floor cleaning machines have been fitted with electrolysis cells for producing an electrochemically-activated cleaning liquid by electrolyzing a feed liquid such as tap water.
Improved floor cleaning heads, mobile floor cleaners, and floor cleaning methods are desired for reducing the use of detergents cleaning operations, while maintaining the efficacy of the floor cleaning operation.
An aspect of the present disclosure relates to an apparatus, which includes a scrubbing disc and an electrolysis cell attached to the scrubbing disc.
Another aspect of the present disclosure relates to a scrubbing disc including a backing having a front face, bristles attached to the front face, and first and second electrodes permanently attached to the backing. The electrodes are spaced from one another by a gap so as to form an electrolysis cell on the scrubbing disc. The electrolysis cell has a liquid inlet and a liquid outlet, which enable liquid flow through the electrolysis cell toward the bristles.
Another aspect of the present disclosure relates to an apparatus including a scrubbing disc and sacrificial electrodes of an electrolysis cell formed integrally to the scrubbing disc so as to form a unitary component part.
Another aspect of the present disclosure relates to a mobile floor cleaner. The cleaner includes, a frame, at least one wheel connected to the frame and enabling movement of the cleaner relative to a surface, a liquid source, a control circuit configured to generate a voltage potential, and a cleaning head. The cleaning head has a scrubbing disc that is rotatable relative to the cleaner in a plane parallel to the surface. The scrubbing disc includes an electrolysis cell that is rotatable with the scrubbing disc. The electrolysis cell is removable from the cleaner with removal of the scrubbing disc. The cleaner further includes a liquid flow path from the liquid source to the electrolysis cell and an electrical connection, which passes the voltage potential from the control electronics to the electrolysis cell.
Another aspect of the present disclosure relates to a mobile floor cleaner, which includes a liquid source, a cleaning head and a scrubbing member carried by the cleaning head. The scrubbing member is rotatable in a plane parallel to the surface and includes an electrolysis cell that is removable from the cleaner with removal of the scrubbing disc. A liquid flow path extends from the liquid source to the electrolysis cell.
Another aspect of the present disclosure relates to a method, which includes: removing a first scrubbing disc from a mobile floor cleaner, the first scrubbing disc comprising a first, sacrificial electrolysis cell; retaining a control circuit for the first electrolysis cell on the mobile floor cleaner during the step of removing; and after removing the first scrubbing disc, attaching a second scrubbing disc comprising a second sacrificial electrolysis cell to the mobile floor cleaner such that the second electrolysis cell becomes electrically connected to the control circuit.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not indented to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. The claimed subject matter is not limited to implementations that solve any or all disadvantages noted in the Background.
The following description of illustrative aspect of the present disclosure. Elements having the same or similar reference number correspond to the same or similar elements.
An aspect of the present disclosure relates to a cleaning tool, such as a rotatable scrubbing member, for a mobile floor cleaning machine that has a sacrificial electrolysis cell incorporated in the scrubbing member. In the example of a rotatable scrub brush, the electrolysis cell may be attached to or integrated within the scrubbing brush so that the cell rotates with the brush.
In one exemplary embodiment, when the electrolysis cell is incorporated in the scrubbing brush, at the point of liquid distribution to the surface being cleaned, the electrolyzed cleaning liquid produced by the cell has less time after production to deactivate prior to application to the surface being cleaned. Also, since such scrubbing brushes are often replaced at regular intervals, problems caused by scaling within the electrolysis cell due to prolonged use of the cell can be avoided. These problems can include blockage to liquid flow and reduced current through the liquid being passed through the cell. These problems can reduce the efficacy of the cleaning liquid produced by the cell. In an exemplary embodiment, the electrolysis cell is permanently mounted to and replaced with the worn scrub brush. Also, since the cell is located at the point of distribution, tubing and other small orifices downstream of the cell may be avoided, which further can reduce the effects of scaling. These technical effects are provided as examples only and are not required in all embodiments of the present disclosure.
In this example, mobile floor cleaner 10 includes a liquid source 12, a cleaning head 14, a scrubbing member drive motor 16 and control electronics 18. Liquid source 12 can include a tank or other solution reservoir carried by the cleaner 10 for containing a feed liquid or can include a fitting or other inlet for receiving the feed liquid from an external source. In an embodiment, the feed liquid includes an aqueous composition, such as 1) regular, untreated tap water or other water that is commonly available, (2) pure water to which one or more electrolytes may be added, (3) chemically treated tap water, and (4) other aqueous solutions suitable for electrolysis.
Cleaning head 14 includes a disc-type scrubbing member, such as a scrubbing brush 30, which is rotated about an axis of rotation 32 by drive motor 16. In this example, axis of rotation 32 is perpendicular to the surface 20 being cleaned and a plane 34 defined by a face of scrubbing brush 30 that engages the surface 20. Thus, scrubbing brush 30 rotates within a plane 34 parallel to the surface 20 being cleaned.
The scrubbing brush 30 carries an electrolysis cell 36, such that the cell 36 rotates with scrubbing brush 30 when the brush is driven by motor 16. The electrolysis cell 36 may be permanently attached or removably attached to scrubbing brush 30. In one embodiment, the electrolysis cell is a sacrificial cell that is permanently attached to the scrubbing brush 30, and the elements of the cell are integrated within the scrubbing brush such that the brush and cell are fabricated together as a single, unitary part. However, the electrolysis cell 36 may be fabricated as a separate component part that is secured to the scrubbing brush 30.
Electrolysis cell 36 includes an inlet 40 for receiving the feed liquid from liquid source 12. The feed liquid can be supplied to electrolysis cell 36 through one or more tube(s) or other liquid conduit(s) 42. The liquid flow path from liquid source 12 to electrolysis cell 36 may include one or more valve(s) 44 and/or pump(s) 45 that are controlled by control electronics 18 through control lines 46 for supplying the feed liquid to the cell and brush during a cleaning operation. In another embodiment, the feed liquid is supplied from liquid source 12 by the operation of gravity, without a pump.
Control electronics 18 also controls operation of drive motor 16 through control lines 48 and controls electrolysis cell 36 through control lines 50. During a cleaning operation, control electronics 18 energizes drive motor 16 to rotate scrubbing brush 30 about axis 32, opens valve(s) 44, energizes pump 45 to supply the feed liquid to cleaning head, and energizes electrolysis cell 36 to electrolyze the feed liquid that passes through the cell.
Control electronics 18 energizes cell 36 by applying a suitable voltage across the electrodes contained in the cell. Since the cell 36 rotates with brush 30 relative to the body of the mobile floor cleaner 10, the control lines 50 may be connected to cell 36 though a contact connection or through a contact-less connection. For example, the connection between the control lines 50 and cell 36 may be made between electrical brushes and electrical contacts, which maintain electrical connection during rotation of the cell 36. In another example, the connection between the control lines 50 and cell 36 may be made through an inductive or other non-contact coupling.
Electrolysis cell 36 generates an electrolyzed cleaning liquid that is dispensed through the scrubbing brush 30 to the surface being cleaned. As the scrubbing brush rotates, the electrolyzed cleaning liquid distributes beneath the brush due to the centrifugal force created by rotation of the brush.
Brush drive motor 16 may be configured to rotate scrubbing brush 30 about axis 32 and/or agitate the scrubbing brush in any other movement, such as a lateral movement on one or more lateral directions.
In addition, cleaning head 14 includes a conduit 72 having a first end configured to be connected to the conduit 42 (shown in
Backing 100 can be formed of any suitable material such as plastic, synthetic material, wood, metal, etc. In a particular example, backing 100 is formed of a rigid plastic material through an injection molding processes. Bristles 102 may be attached in any suitable manner to the lower, front surface of backing 100. In one example, bristles 102 are molded within the backing material. Other methods attachments may be used such as adhesive. Bristles 102 can be made of any suitable material such as plastic, synthetic (e.g., nylon, Talkon, polyester, polypropylene filaments), natural animal hair (e.g. horse or hog hair), metal, abrasives, etc. Also, the bristles or filaments of the brush 30 may be generally aligned vertically as shown in
Electrolysis cell 36 includes first and second electrodes 110 and 112, which in the example shown in
In the example shown in
Brush backing 100 includes and electrical coupling such as first and second electrical conductors, or contacts, 120, 122, which are electrically connected to electrodes 110, 112, respectively. In this example, electrical conductors 120, 122 are formed as coaxial, annular rings on backing 100. These rings are engaged by corresponding electrical brushes 124 carried by the lower surface of shroud 60 (
During operation, control circuit 18 applies a suitable voltage potential across electrodes 110, 112, through control lines 50, terminal block 68, and conductors 120, 122. Feed liquid is supplied to cell 36 through conduit 42 (
After prolonged periods of use, the bristles 102 of scrubbing brush 30 may become worn. In such a case, the scrubbing brush 30 may be removed from the mobile floor cleaner 10 by rotating the brush 30 in a direction to disengage the studs 104 from spring clip 79 and release the studs from slots 78 of adapter 74 (
Another exemplary technical effect of incorporating the electrolysis cell 36 in the scrubbing brush 30, in an exemplary embodiment, is that the feed liquid is electrochemically activated very close to the point of use at the surface being cleaned, at the very end of the liquid flow path. This limits neutralization of the activated cleaning solution from the time at which the liquid is activated by the cell to the time at which the liquid contacts the surface being cleaned.
In the embodiment describe with reference to
The electrodes within the electrolysis cell 36 can have any suitable shape or orientation. In
Referring back to
Electrolysis cell 36 can include any fluid treatment cell that is adapted to apply an electric field across the fluid between at least one anode electrode and at least one cathode electrode. Electrolysis cell 36 can have any suitable number of electrodes, any suitable number of chambers for containing the fluid, and any suitable number of fluid inputs and fluid outputs. In the embodiment shown in
The electrodes 110, 112 can be made from any suitable material, such as a conductive polymer, titanium and/or titanium coated with a precious metal, such as platinum, or any other suitable electrode material. In one example, at least one of the anode or cathode is at least partially or wholly made from a conductive polymer. The electrodes can have any suitable shape and construction. For example, the electrodes can be flat plates, coaxial plates, rods, or a combination thereof. Each electrode can have, for example, a solid construction or can have one or more apertures. In one example, electrodes 110 and 112 are formed of a metallic mesh. In a specific example, one or both of the electrodes 110, 112 is formed of a metallic mesh with regular-sized rectangular openings in the form of a grid. In one specific example, the mesh is formed of 0.023-inch diameter T316 stainless steel having a grid pattern of 20×20 grid openings per square inch. However, other dimensions, arrangements and materials can be used in other examples. The electrodes 110, 112 may be separated by a gap such as but not limited to the range of 0.020 inches to 0.080 inches, such as a gap of 0.040 inches. In addition, multiple cells 36 can be coupled in series or in parallel with one another, for example.
In another embodiment, one or both of the electrodes are formed at least partially or wholly of a conductive polymer, such as those used for static dissipating devices. Examples of suitable conductive polymers are commercially available from RTP Company of Winona, Minn., USA. For example, the electrodes can be formed of a conductive plastic compound having a surface resistivity of 10° to 1012 ohm/sq, such as 101 to 106 ohm/sq. However, electrodes having surface resistivities outside those ranges can be used in other examples.
With conductive polymer, the electrodes can be easily molded with or separately from the brush backing 100 or otherwise formed in any desired shape. For example, the electrodes can be injection molded. As mentioned above, one or more of the electrodes can form a mesh, with regular-sized rectangular openings in the form of a grid. However, the openings or apertures can have any shape, such as circular, triangular, curvilinear, rectilinear, regular and/or irregular. Curvilinear apertures have at least one curved edge. When injection molded, for example, the shapes and sizes of the apertures can be easily tailored to a particular pattern. However, these patterns can also be formed in metallic electrodes in other examples of the present disclosure. The apertures can be sized and positioned to increase the surface area of the electrode for electrolysis and thereby promote generation of gas bubbles in the liquid being treated.
As explained above, electrodes 110, 112 are electrically connected to opposite terminals of a power supply contained within control circuit 18. The power supply can provide a constant DC output voltage, a constant Ac output voltage, a pulsed or otherwise modulated DC output voltage, and/or a pulsed or otherwise modulated AC output voltage to the electrodes 110, 112. The power supply can have any suitable output voltage level, current level, duty cycle or waveform.
For example in one embodiment, the power supply applies the voltage supplied to the plates at a relative steady state. The power supply (and/or control electronics) includes a DC/DC converter that uses a pulse-width modulation (PWM) control scheme to control voltage and current output. Other types of power supplies can also be used, which can be pulsed or not pulsed and at other voltage and power ranges. The parameters are application-specific. In a particular example, the power supply applies a voltage in a range of about 5 volts (V) to about 40V across electrodes 110, 112. In a particular example, control electronics 18 applies a voltage of about 8 volts across the electrodes.
Cell 36 includes a reaction chamber between electrodes 110 and 112. The chamber can be defined by the walls of aperture 130 and the electrodes 110 and 112, for example. During operation, the feed liquid is supplied by liquid source 12 and introduced into the reaction chamber of electrolysis cell 36. In the embodiment shown in
The electrolyzed cleaning disc described above can be implemented in a variety of different types of cleaning or sanitizing systems. For example, they can be implemented on an onboard (or off-board) mobile (or immobile) surface cleaner, such as a mobile hard floor surface cleaner, a mobile soft floor surface cleaner or a mobile surface cleaner that is adapted to clean both hard and soft floors or other surfaces, for example.
In one example, cleaner 300 is similar to the Tennant T5 Walk-Behind Scrubber, which has been modified to include an electrolyzed cleaning disc (such as a scrubbing brush), such as but not limited to those shown in
Cleaner 300 generally includes a base 302 and a lid 304, which is attached along one side of the base 302 by hinges (not shown) so that lid 304 can be pivoted up to provide access to the interior of base 302. Base 302 includes a tank 306 for containing a liquid or a primary cleaning and/or sanitizing liquid component (such as regular tap water) to be treated and applied to the floor surface during cleaning/sanitizing operations. Tank 306 can have any suitable shape within base 302, and can have compartments that at least partially surround other components carried by base 302.
Base 302 carries a motorized scrub head 310, which in this example includes two rotatable scrubbing members 312, a shroud 314, and a scrubbing member drive motor 316. Scrubbing member 312 may include one or more brushes, such as bristle brushes, pad scrubbers, microfibers, or other hard (or soft) floor surface scrubbing elements, for example. As explained above, scrubbing member 312 incorporates one or more electrolysis cells 336 (such as a cell similar to cell 36 shown in
Base 302 further includes a machine frame 317, which supports source tank 306 on wheels 318 and castors 319. Wheels 318 are driven by a motor and transaxle assembly, shown at 320. The rear of the frame carries a linkage 321 to which a fluid recovery device 322 is attached. In the embodiment of
In a further exemplary embodiment, the fluid recovery device includes a non-vacuumized mechanical device for lifting the soiled solution away from the floor surface and conveying the soiled solution toward a collection tank or receptacle. The non-vacuumized mechanical device can include, for example, a plurality of wiping media such as pliable material elements, which are rotated into contact with the floor surface to engage and lift the soiled solution from the floor surface.
In another embodiment, cleaner 300 includes a wand sprayer and extractor or other attachment (not shown) that can be used to clean off-floor surfaces.
Cleaner 300 may further include a battery compartment 340 in which batteries 342 reside. Batteries 342 provide power to drive motor 316, vacuum fan or pump 344, and other electrical components of cleaner 300. Vacuum fan 344 is mounted in the lid 304. A control unit 346 mounted on the rear of the body of cleaner 300 includes steering control handles 348 and operating controls and gages for cleaner 300. Cleaner 300 includes control electronics 350 for controlling the operation of electrolysis cell 336. Control electronics 350 may be separate from control unit 346 or incorporated within control unit 346. Control electronics 350 operates as discussed above with respect to the embodiments of
Liquid tank 306 is filled with a liquid to be treated for cleaning and/or sanitizing use, such as regular tap water. In one embodiment, the liquid is free of any surfactant, detergent or other cleaning chemical. Cleaner 300 further includes an output fluid flow path 360, which includes a pump 364. Tank 306 and pump 364 can be positioned anywhere on cleaner 300. In this example, pump 364 is mounted beneath source tank 306 and pumps water from tank 306 along flow path 360 to the electrolysis cell within scrubbing member 312 and ultimately to floor 325, wherein recovery device 322 recovers the soiled liquid and returns it to recovery tank 308. The arrows in
In one embodiment of the disclosure, the control unit 346 is configured to operate pump 364 and electrolysis cell 336 in an “on demand” fashion. Pump 364 is in an “off” state and electrolysis cell 336 is de-energized when cleaner 300 is at rest and not moving relative to the floor being cleaned. Control unit 346 switches pump 364 to an “on” state and energizes electrolysis cell 336 when cleaner 300 travels in a forward direction relative to the floor, as indicated by arrow 365. In the “on” state, pump 364 pumps water from tank 306 through flow path 360 to electrolysis cell 336 within scrub head 310. Thus, electrolysis cell 336 generates and delivers electrochemically-activated water “on demand”.
As the water passes through electrolysis cell 336 within scrubbing member 312, the cell temporarily restructures the water by injecting nanobubbles into the water so that it becomes highly oxygenated. In upon exiting cell 336, the oxygenated water dispenses directly to the floor being cleaned, for example.
As cleaner 300 advances at a typical rate across the surface being cleaned, the residence time on the surface between distribution to the surface and then recovery by vacuum squeegee 324 is relatively short, such as about three seconds. In one example, the electrochemically-activated water maintains its electrochemically activated properties and does not neutralize until after the liquid has been recovered from the surface. This allows the advantageous properties of each liquid to be utilized during a common cleaning operation.
After recovery, the nanobubbles begin to diminish and the liquid begins to neutralize. Once neutralized, the electrochemical properties, including the pH, of the recovered, blended liquid reverts to those of regular tap water.
Control electronics 350 and electrolysis cell 336 can be powered by batteries 342 or by one or more separate power supplies that are powered by or independent of batteries 342 and adapted to provide the electrodes with the desired voltage and current levels in a desired waveform.
The liquid distribution path of cleaner 300 can also include, if desired, one or more filters for removing selected components or chemicals from the feed water to reduce residue left on the surface being cleaned.
An aspect of the present disclosure relates to an apparatus comprising:
In a particular embodiment, the electrolysis cell is permanently attached to scrubbing disc.
In a particular embodiment, the electrolysis cell is removably attached to scrubbing disc.
In a particular embodiment, the scrubbing disc comprises:
In a particular embodiment, the electrolysis cell comprises first and second electrolysis electrodes molded within material forming the backing.
In a particular embodiment;
In a particular embodiment, the first and second electrodes are planar, oriented parallel to at least one of the front and back surfaces and overlap the aperture.
In a particular embodiment, the first and second electrodes are mesh electrodes, which enable water to pass through the aperture and the first and second electrodes, from the back surface toward the front surface by gravity.
In a particular embodiment, the scrubbing material comprises bristles molded within material forming the backing.
In a particular embodiment, the scrubbing disc comprises an electrical coupling, which is electrically connected to the electrolysis cell and configured to receive electrical power during agitation of the scrubbing disc relative to a cleaning device to which the scrubbing brush is configured for mounting.
In a particular embodiment, the electrical coupling comprises a coupling selected from the group consisting of:
In a particular embodiment, the scrubbing brush comprises a mechanical connection configured to receive a rotating driving force to rotate the scrubbing brush.
Another aspect of the present disclosure relates to a scrubbing disc comprising:
In a particular embodiment, the first and second electrodes and the bristles are molded within material forming the backing.
Another aspect of the present disclosure relates to an apparatus comprising:
Another aspect of the present disclosure relates to a mobile floor cleaner comprising:
Another aspect of the present disclosure relates to a mobile floor cleaner comprising:
Another aspect of the present disclosure relates to a method comprising:
For the purposes of promoting an understanding of the principles of the present disclosure, reference has been made to the particular embodiments illustrated in the drawings, and specific language has been used to describe these embodiments. However, no limitation of the scope of the appended claims is intended by this specific language, and the appended claims should be construed to encompass all embodiments that would normally occur to one of ordinary skill in the art.
The embodiments herein may be described in terms of functional block components and various process steps. Such functional blocks, such as the control circuit for the electrolysis cell and/or the other control electronics aboard the cleaning machine may be realized by any number of hardware and/or software components that perform the specified functions. For example, the described embodiments may employ various integrated circuit components, e.g., memory elements, processing elements, logic elements, look-up tables, and the like, which may carry out a variety of functions under the control of one or more microprocessors or other control devices. Similarly, where the elements of the described embodiments are implemented using software programming or software elements may be implemented with any programming or scripting language such as C, C++, Java, assembler, or the like, with the various algorithms being implemented with any combination of data structures, objects, processes, routines or other programming elements. Functional aspects may be implemented in algorithms that execute on one or more processors. Furthermore, the embodiments of the disclosure could employ any number of conventional techniques for electronics configuration, signal processing and/or control, data processing and the like.
The particular implementations shown and described herein are illustrative examples and are not intended to otherwise limit the scope of the appended claims in any way. For the sake of brevity, conventional electronics, control systems, software development and other functional aspects of the systems (and components of the individual operating components of the systems) may not be described in detail. Furthermore, the connecting lines, or connectors shown in the various figures presented are intended to represent exemplary functional relationships and/or physical or logical couplings between the various elements. It should be noted that many alternative or additional functional relationships, physical connections or logical connections may be present in a practical device. Moreover, no item or component is essential to the practice of the subject matter of the appended claims unless the element is specifically described as “essential” or “critical”.
The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
The use of the terms “a” and “an” and “the” and similar terms in the context of describing the embodiments of the disclosure (especially in the context of the following claims) should be construed to cover both the singular and the plural. Furthermore, recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. Finally, the steps of all methods described herein are performable in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the various exemplary embodiments of the disclosure and does not pose a limitation on the scope of the appended claims unless otherwise claimed. Numerous modifications and adaptations will be readily apparent to those skilled in this art without departing from the spirit and scope of the disclosure and/or the appended claims.
This application claims the benefit of U.S. Provisional Patent Application No. 61/884,787, filed 30 Sep. 2013, the content of which is hereby incorporated by reference in its entirety.
Number | Name | Date | Kind |
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20110219555 | Field et al. | Sep 2011 | A1 |
Number | Date | Country |
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2168604 | Mar 2010 | EP |
1070397 | Jun 1967 | GB |
2002-66199 | Mar 2002 | JP |
2005-6816 | Jan 2005 | JP |
2007095094 | Aug 2007 | WO |
Entry |
---|
International Search Report and Written Opinion dated Nov. 25, 2014 for corresponding International Application No. PCT.US2014/057754, filed Sep. 26, 2014. |
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20150089753 A1 | Apr 2015 | US |
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61884787 | Sep 2013 | US |