| Patents for H04R 23 - Transducers other than those covered by groups (1,562) | 
|---|
| 12/16/2003 | CA2214462C Passive acousto-optic modulator | 
| 12/10/2003 | EP1163632B1 Surface acoustic wave converter and identification system using the same | 
| 12/04/2003 | WO2002082858A3 Sound and vision system | 
| 12/03/2003 | EP1367855A1 Vibration detector | 
| 11/20/2003 | WO2003096223A1 Mutant sequence analyzer | 
| 11/20/2003 | WO2003014774A3 Amplified tree structure technology for fiber optic sensor arrays | 
| 11/20/2003 | US20030215103 Parametric virtual speaker and surround-sound system | 
| 11/20/2003 | US20030214199 Electroactive polymer devices for controlling fluid flow | 
| 11/13/2003 | US20030209656 Optical transducers and method of making same | 
| 11/12/2003 | EP0715801B1 Airborne sensor for listening to acoustic signals | 
| 11/11/2003 | US6647537 IEEE 1394 cable connector with short circuit switch | 
| 11/06/2003 | WO2003092321A1 Sound focus speaker of gas-filled sound lens attachment type | 
| 11/06/2003 | US20030207882 Aminoheterocyclic derivatives as antithrombotic or anticoagulant agents | 
| 10/30/2003 | WO2003047306A3 Radial power megasonic transducer | 
| 10/23/2003 | WO2002080616A3 Optical microphone for communication devices | 
| 10/22/2003 | CN1125576C Very thin loudspeaker and its manufacture method | 
| 10/14/2003 | CA2261108C Acoustic heterodyne device and method | 
| 10/09/2003 | WO2003084285A1 Sound-to-vibration conversion apparatus | 
| 10/09/2003 | WO2002104067A3 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology | 
| 10/02/2003 | WO2003081762A1 Electroactive polymer devices for moving fluid | 
| 09/25/2003 | US20030179384 Membrane type optical transducers particularly useful as optical microphones | 
| 09/18/2003 | US20030173507 Optical transducers of high sensitivity | 
| 09/18/2003 | US20030173506 Optical transducers and methods of making same | 
| 09/11/2003 | US20030168946 Radial power megasonic transducer | 
| 09/09/2003 | US6618124 Optical microphone/sensor | 
| 08/28/2003 | WO2003014674A3 Two delay coil sagnac-based sensor array | 
| 08/12/2003 | US6604363 Matching an acoustic driver to an acoustic load in an acoustic resonant system | 
| 08/06/2003 | EP1333245A1 Fine displacement detection device by sound or the like | 
| 08/05/2003 | US6603105 Smart optical microphone/sensor | 
| 07/30/2003 | EP1330867A1 Actuating member and method for producing the same | 
| 07/30/2003 | CN1433663A 光学声电换能器 Optical acoustic-electric transducer | 
| 07/30/2003 | CN1433661A Piezoelectric film sonic emitter | 
| 07/16/2003 | EP1327376A2 Optical heads for optical microphone/sensors | 
| 07/15/2003 | US6594198 Digital signal demodulator calibration system and method for optical hydrophones | 
| 07/10/2003 | WO2003056545A1 Electropneumatic horn | 
| 07/10/2003 | US20030128958 Optical microphone for communication and other devices | 
| 07/02/2003 | CN1113493C Electronic circuits having noise eliminating element | 
| 06/24/2003 | US6583533 Electroactive polymer electrodes | 
| 06/18/2003 | CN1425264A Bone conduction transducer and bone conduction speaker headset therewith | 
| 06/12/2003 | WO2003049494A1 Optical microphone | 
| 06/12/2003 | WO2003049491A2 High frequency thermoacoustic energy converter | 
| 06/10/2003 | US6578165 Internal guardband for semiconductor testing | 
| 06/10/2003 | US6577738 Parametric virtual speaker and surround-sound system | 
| 06/05/2003 | WO2003047306A2 Radial power megasonic transducer | 
| 06/05/2003 | WO2003046498A1 Optical displacement sensor | 
| 05/22/2003 | WO2003043377A1 Optical displacement sensor element | 
| 05/22/2003 | WO2003043376A1 Diaphragm structure of light-sound converter | 
| 05/13/2003 | US6562650 Microfabricated transducers formed over other circuit components on an integrated circuit chip and methods for making the same | 
| 05/02/2003 | EP0720810B1 Rotary low-frequency sound reproducing apparatus and method | 
| 05/01/2003 | WO2002087279A3 Matching an acoustic driver to an acoustic load in an acoustic resonant system | 
| 04/30/2003 | CN2548382Y Terminal assembling mechanism of earphone microphone | 
| 04/24/2003 | WO2003034778A2 Electroacoustic device and method of quality control | 
| 04/15/2003 | US6549631 Pressure transducing assembly | 
| 04/10/2003 | US20030067841 Digital signal demodulator calibration system and method for optical hydrophones | 
| 04/08/2003 | US6545384 Electroactive polymer devices | 
| 04/08/2003 | US6543110 Electroactive polymer fabrication | 
| 04/02/2003 | EP1297721A2 Gas flow sensor, speaker system and microphone | 
| 04/01/2003 | US6542244 Variable sensitivity acoustic transducer | 
| 03/19/2003 | EP1084590A4 Folded sagnac sensor array | 
| 03/13/2003 | US20030048913 Bone-conduction transducer and bone-conduction speaker headset therewith | 
| 03/13/2003 | US20030048698 Bias control of electrostatic transducers | 
| 03/12/2003 | CN1402955A Acoustoelectric transducer using optical device | 
| 03/04/2003 | US6529444 Folded sagnac sensor array | 
| 02/27/2003 | US20030039368 Optical microphone noise suppression system | 
| 02/20/2003 | WO2003014774A2 Amplified tree structure technology for fiber optic sensor arrays | 
| 02/20/2003 | WO2003014674A2 Two delay coil sagnac-based sensor array | 
| 02/20/2003 | US20030035343 Optical microphone/sensor | 
| 02/13/2003 | US20030032211 Microfabricated transducers formed over other circuit components on an integrated circuit chip and methods for making the same | 
| 02/13/2003 | DE10138434C1 Fokussierender elektroakustischer Wandler und Verfahren zum Test seiner Ausgangsleistung The focusing electroacoustic transducer and method for testing of its output | 
| 02/12/2003 | EP1283517A2 Focussed electro-acoustic transducer and method for testing its output power | 
| 02/06/2003 | US20030026435 Focussing electroacoustic transducer and method for testing its output power | 
| 01/23/2003 | US20030016838 Optical microphone systems and method of operating same | 
| 01/15/2003 | EP1275268A1 Bone-conduction transducer and bone-conduction speaker headset therewith | 
| 01/09/2003 | US20030008625 Microphone arrangement for mobile telephones | 
| 01/09/2003 | US20030007890 Light reflecting surfaces | 
| 01/09/2003 | US20030007656 Device for detecting pressure fluctuations, display device, recording device and sound reproduction system | 
| 01/09/2003 | US20030006184 Low frequency acoustic converter | 
| 01/03/2003 | WO2002034009A3 Optical heads for optical microphone/sensors | 
| 01/03/2003 | WO2001087009A3 Gas flow sensor, speaker system and microphone | 
| 01/02/2003 | US20030002129 Optical acoustoelectric transducer | 
| 12/27/2002 | WO2002104069A1 Diaphragm structure of light sound converter | 
| 12/27/2002 | WO2002104067A2 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology | 
| 12/27/2002 | WO2002103294A1 Sensor using electro active curved helix or double helix | 
| 12/24/2002 | US6498853 Echo-cancelling optical microphone | 
| 12/19/2002 | US20020191802 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology | 
| 12/11/2002 | EP1265456A2 Low frequency acoustic converter | 
| 12/10/2002 | US6493451 Communication helmet | 
| 12/05/2002 | US20020181049 Optical heads for optical microphone/sensors | 
| 12/05/2002 | US20020178831 Force sensing device | 
| 12/05/2002 | US20020178736 Matching an acoustic driver to an acoustic load in an acoustic resonant system | 
| 12/03/2002 | US6489707 Method and apparatus for generating acoustic energy | 
| 11/28/2002 | WO2002095342A1 Device for detecting pressure fluctuations, display device, recording device and sound reproduction system | 
| 11/27/2002 | EP1260116A1 Folded sagnac sensor array | 
| 11/21/2002 | WO2002093773A1 Parametric virtual speaker and surround-sound system | 
| 11/21/2002 | US20020171822 Thin optical microphone/sensor | 
| 11/21/2002 | US20020171636 Sound and vision system | 
| 11/21/2002 | CA2446645A1 Parametric virtual speaker and surround-sound system | 
| 11/20/2002 | EP1258714A2 Optical converting type ultrasonic receiving apparatus | 
| 11/19/2002 | US6483619 Optical-interference microphone | 
| 11/14/2002 | US20020166955 Optical converting type ultrasonic receiving apparatus |