| Patents for H04R 23 - Transducers other than those covered by groups (1,562) |
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| 05/27/1992 | EP0486825A2 Electro-hydraulic driving device |
| 05/12/1992 | US5113070 Temperature compensator for an optic fiber pressure transducer |
| 05/05/1992 | CA1300256C Inertial microphone/receiver with extended frequency response |
| 04/02/1992 | WO1992005458A1 Modular micro-optical systems and method of making such systems |
| 03/25/1992 | EP0476620A2 Noise reducing element and electrical circuit having the same |
| 03/03/1992 | US5093742 Ferro-electric liquid-crystal panel having a chiral-nematic mesophase in a phase translation system |
| 02/25/1992 | US5091959 Speaker system |
| 11/12/1991 | US5064165 Semiconductor transducer or actuator utilizing corrugated supports |
| 10/29/1991 | US5062139 Coaxial loud speaker system |
| 10/22/1991 | US5060274 Hydrostatic speaker and speaker driver |
| 10/01/1991 | US5052228 Shear stress measuring device |
| 09/10/1991 | US5047683 Hybrid transducer |
| 08/06/1991 | CA1287394C Multiple loudspeaker with piezoelectric "tweeter" supported in such away as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm |
| 07/10/1991 | EP0436437A1 Optoacoustical transducer |
| 06/11/1991 | US5022405 Stethoscope for use in nuclear magnetic resonance diagnostics |
| 04/23/1991 | US5010248 Sampling hydrophone |
| 04/23/1991 | US5009108 Vibrating type transducer |
| 03/19/1991 | CA1281809C Parallel rays lens for optical telephone |
| 12/13/1990 | WO1990015513A1 Multi-driver loudspeaker system |
| 11/13/1990 | US4969676 Air pressure pick-up tool |
| 10/30/1990 | CA1275581C Method of producing a fiber-optical reflection sensor and sensor so produced |
| 10/18/1990 | WO1990012296A1 Semiconductor transducer or actuator utilizing corrugated supports |
| 09/26/1990 | EP0368858A4 Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same |
| 09/20/1990 | DE3908402A1 Subwoofer loudspeaker |
| 08/07/1990 | US4947437 Stereo microphone |
| 08/07/1990 | US4945916 Optical device for the simultaneous detection of heart and respiratory movements |
| 07/24/1990 | US4942767 Pressure transducer apparatus |
| 06/28/1990 | WO1990007250A1 Microphone with interferometric detection of acoustic pressure |
| 05/30/1990 | EP0370846A1 Electroacoustic transducer |
| 05/23/1990 | EP0368858A1 Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same. |
| 05/22/1990 | US4926696 Optical micropressure transducer |
| 05/10/1990 | CA2002803A1 Electroacoustic transducer |
| 04/11/1990 | EP0363032A2 Flextensional transducers |
| 03/27/1990 | US4912086 Voice coil and diaphragm |
| 02/14/1990 | EP0354229A1 Hydrophonic probe. |
| 12/14/1989 | WO1989012375A1 Optical microphone |
| 12/14/1989 | DE3818931A1 Loudspeaker box |
| 12/13/1989 | EP0345804A2 Hydrostatic speaker and speaker driver |
| 07/27/1989 | WO1989006512A1 Hydrophonic probe |
| 05/18/1989 | DE3737846A1 Microphone with optical fibres, non-electric and non-metallic pick-up |
| 02/21/1989 | US4805985 Method of producing a fiber-optical reflection sensor and sensor so produced |
| 01/25/1989 | EP0300555A1 Electroacoustic transducer comprising a superconducting element |
| 01/17/1989 | US4799202 Complementary interferometric hydrophone |
| 01/12/1989 | WO1989000295A1 Systems and methods for sensing position and movement |
| 12/06/1988 | US4789801 Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same |
| 10/06/1988 | WO1988007785A1 Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same |
| 08/30/1988 | US4767973 Systems and methods for sensing position and movement |
| 08/23/1988 | US4766607 Method of improving the sensitivity of the earphone of an optical telephone and earphone so improved |
| 08/09/1988 | US4763358 Rotary sound transducer |
| 07/27/1988 | CN87216711U Radio earphone |
| 07/13/1988 | CN87208026U Multi-function electro-magnetic vibrating loud speaker |
| 07/07/1988 | DE3642055A1 Device for directly converting sound into digital information, digital microphone |
| 06/15/1988 | EP0271369A1 Optical device for the simulataneous detection of heart and breathing motions |
| 06/14/1988 | US4751690 Fiber optic interferometric hydrophone |
| 06/02/1988 | WO1988004126A1 Optical micropressure transducer |
| 03/22/1988 | US4732040 Electrodynamically producing ultrasonic waves |
| 01/13/1988 | CN87206536U Color-light loudspeaker |
| 10/21/1987 | EP0148893B1 Integrated electroacoustic transducer |
| 08/25/1987 | US4689827 Photofluidic audio receiver |
| 08/18/1987 | US4688200 Optical system for detecting acoustic wave energy in a fluid medium |
| 07/07/1987 | CA1223954A1 Optical fibre hydrophone |
| 05/19/1987 | US4665752 Electrodynamic transducer |
| 05/06/1987 | EP0220354A2 Loudspeaker combination with piezo-electric tweeter |
| 03/31/1987 | US4654546 Electromechanical film and procedure for manufacturing same |
| 03/10/1987 | CA1219056A1 Integrated electroacoustic transducer |
| 03/10/1987 | CA1219055A1 Multi-driver loudspeaker |
| 02/03/1987 | US4641377 Photoacoustic speaker and method |
| 01/21/1987 | EP0209515A1 Fibre-optic detector |
| 07/15/1986 | CA1207548A1 Optical transducer |
| 07/08/1986 | US4599711 Multi-lever miniature fiber optic transducer |
| 06/03/1986 | US4593385 Fiber optic sensor lead fiber noise cancellation |
| 05/28/1986 | EP0182764A2 Electromechanical film and procedure for manufacturing same |
| 05/20/1986 | US4590620 Optical telephone |
| 05/13/1986 | CA1204498A1 Multi-driver loudspeaker |
| 05/13/1986 | CA1204496A1 Acoustic power meter |
| 02/11/1986 | US4570248 Interferometric hydrophone reference leg low frequency compensation |
| 01/28/1986 | CA1199875A1 Subwoofer speaker system |
| 01/21/1986 | US4566135 Pressure transducer |
| 01/21/1986 | CA1199707A1 Engine and transmission control system for combines and the like |
| 01/15/1986 | EP0168011A2 Electrodynamic transducer |
| 01/14/1986 | US4564727 Subwoofer speaker system |
| 11/19/1985 | US4554414 Multi-driver loudspeaker |
| 08/20/1985 | US4536861 Optical fibre hydrophone |
| 08/06/1985 | US4533795 Integrated electroacoustic transducer |
| 07/24/1985 | EP0148893A1 Integrated electroacoustic transducer. |
| 07/16/1985 | US4530078 Microbending fiber optic acoustic sensor |
| 07/10/1985 | EP0147992A2 Multi-driver loudspeaker |
| 07/02/1985 | CA1189721A1 Fiber optical measuring device for measuring electrical and magnetic quantities by laterally controlled photo-luminescence |
| 04/30/1985 | US4514860 Fiber optical measuring device for measuring electrical and magnetic quantities by laterally controlled photo-luminescence |
| 03/26/1985 | CA1184649A1 Method and device for transforming an audiofrequency periodic voltage into acoustic waves and vice-versa |
| 03/12/1985 | US4504703 Electro-acoustic transducer |
| 03/05/1985 | US4503564 Opto-acoustic transducer for a telephone receiver |
| 02/05/1985 | US4497981 Multi-driver loudspeaker |
| 01/31/1985 | WO1985000495A1 Integrated electroacoustic transducer |
| 01/08/1985 | US4492107 Acoustic power meter |
| 11/20/1984 | CA1178365A1 Electroacoustic transducer |
| 11/13/1984 | US4482788 Transducer for the transformation of electrical modulations into vibratory modulations |
| 10/23/1984 | US4479265 Laser microphone |
| 10/16/1984 | US4477892 Surface acoustic wave device having a pyramid shaped tip for recording video information on a substrate |
| 10/03/1984 | EP0120737A1 Optical fibre hydrophone |