Heretofore creation, learning, and enjoyment of music has been very expensive as most musical instruments have been acoustically loud, bulky and expensive and therefore beyond the reach of ordinary people.
The following is a compilation of some possibly relevant prior art that shows various alternative musical instruments that can be made affordable by the average person.
US Published Patent Application 2009/0126554 (2009) to Xu et al. for “Finger Musical Instrument”
U.S. Pat. No. 4,414,537 (1983) to Grimes for “Digital Data Entry Glove Interface Device”
U.S. Pat. No. 4,613,139 (1986) to Robinson for “Video Control Gloves”
U.S. Pat. No. 4,635,516 (1987) to Giannini for “Tone Generating Glove and Associated Switches”
U.S. Pat. No. 4,681,012 (1987) to Stelma et al. for “Drummer's Glove”
U.S. Pat. No. 4,700,602 (1987) to Bozzio for “Electronic Drum”
U.S. Pat. No. 4,753,146 (1988) to Seiler for “Portable Electronic Drum Set”
U.S. Pat. No. 5,119,709 (1992) to Suzuki et al. for “Initial Touch Responsive Musical Tone Control Device”
U.S. Pat. No. 5,338,891 (1994) to Masubuchi et al. for “Musical Tone Control Device With Performing Glove”
U.S. Pat. No. 5,512,703 (1996) to Usa for “Electronic Musical Instrument Utilizing A Tone Generator Of A Delayed Feedback Type Controllable By Body Action”
U.S. Pat. No. 5,581,484 (1996) to Prince for “Finger Mounted Computer Input Device”
U.S. Pat. No. 6,734,349 B1 (2004) to Adams for “Fingertip Musical tap Assembly”
U.S. Pat. No. 6,819,771 (2004) to Menzies for “Vest With Piezoelectric Transducer for Practicing Music”
U.S. Pat. No. 7,012,593 B2 (2006) to Yoon et al. for “Glove-Type Data Input Device and Sensing Method Thereof”
U.S. Pat. No. 7,381,884 B1 (2008) to Atakhanian for “Sound Generating Hand Wear”
UK Patent Application 2,221,557 to Chau King Sze (1990) for “Electronic Musical Instrument”
UK Published Patent Application 2,286,035 (1995) to Pendleton for “Control Device, e.g. for Computers, with Contacts on the User's Hand”
UK Published Patent Application 2,305,714 to Rosenberg (1997) for “A Keyboard Glove”
UK Published Patent Application 2,320,315 to Heping He (1998) for “A Keyboard Glove for Use by the Blind”
WIPO PCT Published Patent Application WO 8,912,858 (1989) to Katsumi for “Manual Data Input/Output System”
There are many types of electronic gloves, most of which are intended for use in applications other than electronic music or more specifically electronic percussion.
A number of prior-art data entry patents include sensors that are located somewhere in the palm area. However, none of these employ a palm sensor as a hand percussion input or as an input that operates separately from other sensors on the glove. One patent that does employ a palm sensor to contact a surface other than another sensor on the glove is used with a surface that is wired to the palm sensor as shown in the Pendleton Application above. However that device cannot be employed to generate an electronic signal by striking any convenient planar hard or rigid surface.
Although Atakhanian does employ a sensor located generally in the palm area, that palm sensor is only used in conjunction with other finger sensors and is not used as a direct input to strike any surface for the purpose of generating a bass sound, of the type generated by the normal hand movement of a hand percussionist in striking an instrument, such as bongos, congas, tablas, etc.
The presence of a palm sensor for generating a bass input would not limit the commercial use of an e-glove or e-ring apparatus to hand percussion. The user could choose to use it for other purposes. For instance, a user could still use the glove for generating other inputs, such as striking a surface in a manner intended to generate sounds corresponding to striking a drum with drum sticks or striking cymbals.
It has been assumed that essentially the same functions could be performed with either the e-gloves or the e-rings. In some cases the e-rings can be used to generate percussion sounds for an acoustic drum set including a bass drum, snare drums tom-toms and cymbals. However, the e-glove can also be used for this purpose. In another aspect, sensors on the percussionist's feet or on other parts of the body are used.
Stereo plugs are attached to a bracelet for stereo applications. Wireless communication as an alternative to wired embodiment has been addressed, notwithstanding such wireless communication is known for other remotely or tangentially related applications.
Suzuki et al. show a glove including sensors on the fingers used for musical keyboard input. Related patents (assigned to Yamaha) are representative of prior art that employs pivotal or flexible glove sensors to detect the flexure of the wearer's fingers. This signal is used to generate an initial touch response, such as the velocity of movement of the finger, before an actual touch. The initial touch signal along with an after touch signal and a key on signal can be transmitted to an electric organ, synthesizers or similar keyboard device. These signals can be used by dancers, etc. to generate more complete musical sounds based on body movements.
Such a flex sensor, as opposed to a pressure sensor such as a piezoelectric sensor, would not appear to be suitable for use by a hand percussionist so that a signal would be generated when a surface is struck. Furthermore, such flex sensors would appear to be much more complicated. Significantly the flex sensor used on these Yamaha devices would appear to be incompatible with a palm sensor. Other examples of these Yamaha devices are shown in Usa and Masubuchi, above, among others.
Atakhanian shows a musical instrument including finger sensors and a sound box, all incorporated into a glove. The glove has separate sensors on each finger, including on the knuckle in addition to the fingertips. Palm sensors are also employed. Unique signal patterns of each of the signals from these sensors result in specific audible sounds. Speakers are mounted on the gloves and the potentiometers are used as sensors. A digital signal processor on the glove can be programmed to recognize the unique patterns. Although the sensors located near the ends of the fingers appear to be intended to create musical and rhythmic patterns by tapping their fingers on any suitable surface, the sensors located near the knuckles and in the palm regions appear intended to be contacted by the sensors near the ends to modify the audible musical sounds so that the user can create a wide range of notes, rhythms and/or melodies with the glove. The knuckle and palm sensors thus appear to be essentially “function keys” and are not intended to be used to tap or strike a surface as would the palm contact of applicant's music system. There is no suggestion that the palm sensor be used as a bass input for drums.
Xu shows a glove with fingertip keys connected to sound boxes located on the backside of a glove. The glove also includes range selection switches located on the glove heel that give a greater octave range. The fingertip sensors employed in this apparatus appear to be located on the back of the fingers at the tips and not on the interior surface that would strike a surface as part of a percussion stroke.
Giannini shows a switch that can be used at the finger joints in a glove in which a contact is made when the fingers flex about the joints. The switches appear to be located on the backside of the gloves instead of on the inside, and this glove can include an AM or FM transmitter.
Sze Chau King shows a glove musical instrument in which four finger contacts, in the form of spring members, are connected to a speaker of piezo buzzer on the back of the gloves.
Hand Wearable Sensors for Data Entry
A large number of prior art patents show glove type devices that are used for computer keyboard input or data entry. For example, Prince above discloses a glove having fingertip pressure sensors, such as piezoelectric sensors, and acceleration sensors. These sensors can be used for computer or keyboard input.
Yoon et al. above shows an input glove that includes sensors located at the fingertips. The switches can operate in a digital or analog mode. An analyzer determines input data by analyzing the sensing signal. Once the input signal in determined by the analyzer, the input signal outputs the determination signal to an external terminal. For example, digital inputs can be generated in response to a combination of simultaneously pressed sensors, the number of sensors pressed, the duration of sensor pressing or the pressure applied to sensors. Typically inputs can be generated by touching two sensors (i.e. two fingers) together. Thus the individual finger sensors do not appear to act independently.
Pendleton shows a glove having contact sensors located on the thumb and fingers of a hand, as well as a sensor located on the palm heel of the hand. The contact sensors employed in this device are intended to close a circuit when contacted with a conductive surface on a separate pad. Thus this device is not intended to generate a signal when striking any surface, such as the e-glove I e-ring apparatus. It is unclear whether the palm sensor is located in a position that would be suitable for use by a hand percussionist. I.e., a sensor may be located on the inside of the hand at a point spaced from the fingers. Clearly this device would not be used to generate a signal by striking a blow.
Grimes discloses a data entry glove having proximity touch sensors located on the fingertips. This patent also shows a knuckle bend sensor that can be located at the knuckle of the index finger and extending into the palm region. This is not a touch or percussion impact sensor. However, one embodiment of this glove employs a touch sensor at the base of the ring finger at a position that appears to be along the raised surface at the top of the palm. This touch sensor is however intended to be activated by the thumb, and would not appear to comprise a sensor for detecting strikes by the hand.
Prince shows finger mounted device for computer input. The sensors mounted on the tips of the fingers appear to be accelerometers.
Rosenberg discloses a keyboard glove in which finger sensors are located on the palm side of the fingertip of the glove is approximately the same position as the finger sensors in e-glove. This keyboard entry device is intended to function as a chord keyboard, a special data entry keyboard that uses fewer keys than a QWERTY keyboard. It has shift or function sensor keys located along the side of the index finger, but does not include any keys or sensors in the palm as in the e-glove or e-ring device.
A specialized data entry device is shown in Heping He, which shows a glove with sensors that generate signals in response to the hand position code used by blind people. Between 45 and 47 push buttons on each glove are located on each finger and in the palm area, so that when touched by fingertips, which extend beyond the glove, according to the standard hand position code, an appropriate signal is transmitted to a computer. This is explicitly a soft touch device. The only relevant teaching is that sensors can be located on the palm. However multiple soft touch palm sensors are employed and it would not seem plausible that a glove of this type could be used by hand percussionist, nor would this device suggest the e-loops, e-ring or e-glove embodiments.
Gloves for Use as Computer Game Input Devices
Robinson discloses a glove with electrical contacts located on the fingers and the thumb for generating inputs to a joystick control port. Signals appear to be generated by touching the thumb to one of the fingers.
Gloves for Generating MIDI Inputs
A number of Internet postings discuss gloves suitable for MIDI inputs. An example of an item termed a Wireless MIDI glove using flex sensors and a series of wires leading to what appears to be a wireless transmitter is shown at http://vipre.uws.edu.aultieml?p=605. I have found many types of electronic gloves, most of which are intended for use in applications other than electronic music or more specifically electronic percussion.
None of these prior-art devices employ a palm sensor as a hand percussion input or as an input that operates separately from other sensors on the glove. The one patent that does employ a palm sensor to contact a surface other than another sensor on the glove is used with a surface that is wired to the palm sensor as shown in the Pendleton application above. That device cannot be employed to generate an electronic signal by striking any convenient surface.
The presence of a palm sensor for generating a bass input would not limit the commercial use of an e-glove or e-ring apparatus to hand percussion. The user could choose to use it for other purposes. For example, a user could still use the glove for generating other inputs, such as striking a surface in a manner intended to generate sounds corresponding to striking a drum with drum sticks or striking cymbals.
Various aspects of my apparatus and associated methods are an improvement over prior art drum kits. My apparatus allows one to play drums without the cost and logistics of drums or a drum-kit. A donnable garment with pressure and trigger sensors creates music, in response to essentially the same hand movements that would be used in striking bongas, congas, tablas, or similar hand-struck musical instruments. These include the same foot movements in controlling the open-close hi-hat or a bass drum, as if on a real drum kit, so as to make the system user or musician transparent.
The following is a brief description of the several views of the drawings complete with reference numerals. The last two least significant digits represent the item (not necessarily tangible) number and the left most one or two digits represent the figure number.
I have used words with their conventional dictionary definitions. The following definitions are included here for clarification.
The Wearable Trigger Electronic Percussion Music System is shown in the several views of the drawings. The embodiments shown are not limited in its application to the details of construction and to the arrangements of the components forth in the following description or illustrated in the drawings. Other embodiments and aspects can be practiced and carried out in various ways. Also the phraseology and terminology employed are for the purpose of descriptions and should not be regarded as limiting their scope.
To provide even greater degree of mobility a wireless radio connection to a mobile phone or smart phone, such as that sold under the trademark BlueTooth, may be employed. A piezo transducer or some other sound pressure transducer-to-electronic voltage signal is connected to the proper electronic connective device, such as the bracelet (shown in
After receiving the signal or the information the receiver further sends the sound, sound signal, or the information from the wireless transmitter (instead of a cable) to be picked up by the receiver of headphones or an amplifier intended to be used.
The state of the art wireless interfaces are miniature enough that they can be easily used for transmission of sensor signal wirelessly to the nearest module in close range of a few feet or the range may be extended with amplification. The wireless option works the same way for a heel carrier, elbow carrier, finger caps, palm strap carrier, foot carrier, and glove embodiments. Hybrid wired and wireless environments may also be employed.
More particularly
Cymbal Choke Effect
When the piezo transducer is struck or otherwise impacted the pressure is converted into an electrical voltage and is sent to the electronic pre-amp and sound module. The player controls impact mode, orientation and timing, etc. by squeezing, between palm and index finger, the tactile switch. This immediately stops the signal, which in turn and stops the sound of the cymbal from the sound module.
The cable and jack cannot be mono. If it's mono then only one of these sensors could be in use. Otherwise only the cymbal initiation or only the tactile switch for stopping the cymbal music can be used. That is why it has to be stereo. Stereo cable uses two wires in one sleeve and is divided like a Y.
This alternative embodiment more particularly illustrates the protocol for the cymbal choke effect.
The present system is also adoptable for dancers. The whole foot may be covered with sound transducers and sensors like a sock (not shown) which would be used by the dancers. The sensor caps are for the front part of the foot, like the front half of the sock that is carrying sound transducers of all kinds, like a piezo sensor, FSR, and even gyroscopes and accelerometers. All of these provide added flexibility to custom design the system for specific objectives, such as user friendliness, cost effectiveness, durability, portability, and all types of other design criteria. The front part of the foot pressure switch can be effectively amplified with one or more sensors of different kinds. The extent of mix and match permutations and combinations is limited only by the imagination of the design engineer.
The operation and use of system is simple and even intuitive. The device provides all the benefits of a as a drum kit but without the expense and bother. The process is also equally simple. a ‘do-it-yourself’ process of creating live music in real time without the use of musical instruments comprises following steps.
1. Mount at least one sensor on at least one limb of a musician by at least one type of mounting to create music of at least one musical instrument.
2. Interface the sensor(s) with an electronics and music module.
3. Select at least one musical instrument is from a group consisting of percussion, key, wind, and string.
4. Further select the percussion instrument from a group consisting of bass drum, snare drum, tom toms, cymbals, hi-hat control, conga, and tabla.
S. Store the sounds of the selected musical instrument(s) in the music module.
6. Interface the output of the electronics and music module to an audio output device.
7. Create music by actuating one or more sensor(s) on one or more limb(s) of a music student or enthusiast against any hard planar surface.
8. Select at least one sensor from a group consisting of tactile, piezo-pressure, pressure-sensitive film, FSR, accelerometer, micro-Arduino, and micro-gyro. (Arduino is a trademark of Arduino, LLC, Cambridge Mass., for a microcontroller.)
9. Select a mounting method from a group consisting of loops, straps, bands, caps, films, gloves, mittens, elbows, ankles, and heels.
10. Mount the selected sensor(s) on a limb. In this patent “limb” means any body part on which a sensor can be mounted, similar to mounting on a limb, namely a body part selected from a group consisting of a finger, a palm, a thumb, a toe, a foot, an elbow, an ankle, a heel, a head, and a back. In this do-it-yourself process of creating live music in real time, a percussion instrument is selected from a group consisting of bass drum, snare drum, tom toms, cymbals, hi-hat control, conga and tabla. Furthermore the cymbal choke effect can be simulated by use of a pressure sensor mounted on the outside and a tactile sensor mounted on the underside of the thumb. The cymbal choke effect is initiated by actuating the pressure sensor by momentary impact of the outside of the thumb against any planar hard surface. The sound is choked and snubbed by making a fist such that the tactile sensor is actuated as it is pushed against the index finger of the fist.
The user wears on (straps on) any other of the wearable musical garments: gloves, finger straps (rings), finger caps, foot straps, or a heel and elbow strap. The user connects it (with cable or wireless) to the drum module, sound module midi sequencer, or any midi apparatus which can transform the signal into information which can be used with virtual studio technology. When connected properly one can listen to the sound via headphones or by an amplifier and speakers).
The user touches or hits any hard surface with a part of the body where the wearable drum trigger is placed. The signal is picked up by a sound transducer placed inside the wearable material, which sends the signal to the appropriate sound module via a cable or wirelessly, where it becomes the sound of an instrument or its part that the user wanted to hear.
The user can play the complete drum set if they puts the wearable drum triggers on their hands and feet. The elbow strap properly imitates a conga dampening skin effect and other percussive and non-percussive instruments and techniques. Any of the sound transducers, for example a foot strap with a tactile switch, can be used as a switch to change programs or sound banks in the drum and sound module.
One can use wearable drum triggers to play piano sounds through midi interface equipment and VST instruments. They can the tactile switches in their foot and heel straps as a octave changer for the finger straps or they can use the caps or as a modulation tool. Since we can use only five tones with five fingers, any of the wearable triggers may have a different role, depending on the user's musical equipment and musical wishes. For example the fingers of the hand can serve as different drum elements which are usually played with hands or drumsticks (snare drum, tom toms, cymbals etc.) while the foot straps can serve as a bass drum and hi-hat pedal, which is the traditional drum setup.
Hi-Hat Control
The hi-hat open-closed sound control is performed between the sensor carrier on the arch of the left foot (
One can easily use the system while practicing, composing, working on creations at home by computer or on the road with a portable standalone module or other adequate equipment, like a portable computer, mobile phone computer, or any appropriate piece of equipment with a midi interface option. The wearable drum triggers can be used with any part of the equipment (standalone or midi interface).
Analogous to stretching a drum skin, applying a pressure can also be done with base of a palm instead of an elbow. It can be done with the FSR or a pressure sensor placed at the base of the palm. A connector from the palm piezo sensor to a bracelet is shown in
While the present apparatus has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments as well as other aspects of the embodiments will be apparent to a person of ordinary skill in the art upon reference to this description.
Many other alternate embodiments and variations are anticipated. For example both the pressure sensor at the base of the palm and the cymbal “choke” option trigger switch may also be incorporated into the gloves embodiment also or a different limb may be used than those used and illustrated here in various embodiments to create the same music. With a little bit of creativity and ingenuity almost any limb can be used for any music or dance especially latest fad or craze dances.
Variations in size, materials, shape, form, function and mode of operation and assembly as well as use are possible without deviating from the embodiments shown. Examples of such contemplated variations include the following:
1. The value and the tolerance of various electronic components may be modified.
2. The wearable triggers may be built with newer materials, technologies and processes as they become available.
4. Any number and any type of sensors may be mounted on in any orientation in or on any donnable flexible material of any type to fit a body limb, including the hand, fingers, foot, toes, arm, leg, ankle, elbow, and even the head, torso, and seat.
5. Any electronic printed circuit board and its conductors can be made of different materials as they become available due to the technological progress in polymer chemistry.
6. Additional complimentary and complementary functions and features may be added.
7. A more economical or an upscale version of the device may be adapted.
8. A music module to simulate any kind of music may be incorporated for each type of musical instrument, including percussion, string, wind, etc.
9. Some of the hardware components, such as pre-amps and amplifiers, etc, may be realized by equivalent firmware or software.
10. Instead of parallel signals with plurality of lines, a single a serial line may be used to bus signals from sensors to the music module, the amplifier, the speakers, etc.
11. An analog-to-digital conversion may be employed when deemed cost effective for an application.
12. Donnable garments in the form of gloves or rings can also be used for additional purposes. For example, drumstick strikes on a drum or a cymbal could be imitated, and the hand worn device can also be used to provide inputs characteristic of keyboard instruments or even for data entry or game playing.
13. Regarding the sound transducer carriers, gloves, finger strap rings, finger caps, foot straps, heel and elbow sound transducer carriers; and the materials used in making them can vary in thickness, texture, elasticity, color, size, and other parameters.
14. Many different kinds of sound transducers and their sizes can be used (piezo films, piezo transducers, FSRs, tactile switches, etc.) in any orientation, permutation, and combinations of sensors, limbs, mounting methods, etc.
15. Flex sensors, gyroscopes, and accelerometers may be affixed onto any sensor support in any combination with the other sound transducer(s) to create more complex sound effects.
16. The sensor caps for the front part of the foot, like a front half of the sock that is carrying sound transducers of all kinds, like a piezo sensor, FSRs, and even gyroscopes and accelerometers may be used. Amplifying the front part of the foot pressure switch with one or more sensors of different kinds can be achieved in this manner.
17. The system may also be adapted for dancers. The whole foot may be covered with sound transducers and sensors, like a sock or mitten (not shown) which would be used by the dancers for contemporary fad craze dances such as break dancing, moonwalk, hip-hop, achy-breaky, and the like.
18. A different limb may be used than illustrated in various embodiments to create the same music. Almost any limb can be used for any music or dance, especially for the latest fad or craze dances.
19. Analogous to stretching a drum skin, applying pressure can be done with base of a palm instead of elbow. It can be done with the FSR or a pressure sensor placed at the base of the palm.
20. Likewise the sound transducers may be mounted on their carrier at any place and in any number in any orientation.
21. A small tactile switch between the thumb and index finger, or any sound transducer at any position on the carrier, may be used.
22. Female and male mono and stereo jacks may be used in any permutation and combination in any mating sizes.
23. Likewise cables of any type may be used in the same mix-and match-manner, so long as they can transfer the signal, whether mono or stereo. Any size is possible but preferably the cables should be as thin and light.
24. Any wireless connection may be employed as long as it transmits and receives the signal or the information. To provide even greater mobility wireless, mobile phone, or smart phone interfaces may be employed.
25. The drum module does not have to be a standalone but can be a sound module, midi equipment, midi sequencer connected to the appropriate equipment with software and sound banks.
26. One can play the piano or any other instruments using wearable drum triggers with the computer along with midi interface instead of standalone drum module (or even with a drum module).
27. A midi interface box may be mounted onto or near to each of the drum trigger carriers, and further connected to the computer, which may be portable, non portable, or a mobile phone computer, as long as it communicates with the carrier.
28. The eye-and-hook fasteners for the leg and hand straps and band loops can be made from any kind of material or tissue.
29. The connective bracelet material, design, and housing in may be varied.
30. Any appropriate material, cloth, tissue, or polymer, can be used.
31. Any wireless equipment device may optionally be backed up by its own power source, battery, etc.
32. A piezo transducer or some other sound transducer may be connected to the proper electronic device with a wireless transmitter (that runs on batteries) to transmit the signal or the information to the wireless receiver, which may be a part of a drum module or some other sound module or other appropriate musical equipment.
33. Hybrid wired and wireless environments may be employed.
34. Upscale and downscale embodiments may be designed, manufactured, and marketed.
35. Other changes, such as aesthetics and substitution of newer materials as they become available, which substantially perform the same function in substantially the same manner with substantially the same result, may be made.
Therefore the foregoing is considered as illustrative only of the principles of operation of the various embodiments. It is therefore contemplated that the appended claim(s) cover any modifications, embodiments as fall within the true scope of this embodiments shown and discussed.
This application claims priority of provisional application Ser. No. 61/267,407, filed Dec. 7, 2009, and titled, “Wearable Drum Triggers”.
Number | Name | Date | Kind |
---|---|---|---|
4414537 | Grimes | Nov 1983 | A |
4613139 | Robinson | Sep 1986 | A |
4635516 | Giannini | Jan 1987 | A |
4681012 | Stelma et al. | Jul 1987 | A |
4700602 | Bozzio | Oct 1987 | A |
4753146 | Seiler | Jun 1988 | A |
5119709 | Suzuki et al. | Jun 1992 | A |
5338891 | Masubuchi et al. | Aug 1994 | A |
5373096 | Suzuki et al. | Dec 1994 | A |
5403972 | Valentine, Sr. | Apr 1995 | A |
5434350 | Haney et al. | Jul 1995 | A |
5512703 | Usa | Apr 1996 | A |
5581484 | Prince | Dec 1996 | A |
5841052 | Stanton | Nov 1998 | A |
5856628 | Noguchi et al. | Jan 1999 | A |
6380923 | Fukumoto et al. | Apr 2002 | B1 |
6734349 | Adams | May 2004 | B1 |
6819771 | Menzies | Nov 2004 | B2 |
7012593 | Yoon et al. | Mar 2006 | B2 |
7135637 | Nishitani et al. | Nov 2006 | B2 |
7381884 | Atakhanian | Jun 2008 | B1 |
7674969 | Xu et al. | Mar 2010 | B2 |
7842879 | Carter | Nov 2010 | B1 |
20040112204 | Javelle | Jun 2004 | A1 |
20070272070 | McGinnis, II | Nov 2007 | A1 |
20090126554 | Xu et al. | May 2009 | A1 |
Number | Date | Country |
---|---|---|
2221557 | Jul 1990 | GB |
2286035 | Feb 1996 | GB |
2305714 | Apr 1997 | GB |
2320315 | Jun 1998 | GB |
8912858 | Dec 1989 | WO |
Number | Date | Country | |
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20110132181 A1 | Jun 2011 | US |
Number | Date | Country | |
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61267407 | Dec 2009 | US |