| Patents for H04R 23 - Transducers other than those covered by groups (1,562) |
|---|
| 10/02/1984 | US4475014 Acoustical transducer |
| 09/25/1984 | US4473721 High-frequency loud speaker |
| 09/11/1984 | US4471474 Coupled waveguide acousto-optic hydrophone |
| 08/08/1984 | EP0114910A1 Subwoofer speaker system |
| 08/07/1984 | US4463825 Method and apparatus for generation of acoustic energy |
| 07/17/1984 | US4460809 Process and device for converting a periodic LF electric voltage into sound waves |
| 05/08/1984 | US4447678 Electracoustic transducer |
| 05/01/1984 | US4446543 Optical resonator single-mode fiber hydrophone |
| 04/17/1984 | US4443731 Hybrid piezoelectric and magnetostrictive acoustic wave transducer |
| 02/28/1984 | US4434481 Traveling wave surface acoustic wave transducer |
| 12/20/1983 | US4422182 Digital microphone |
| 12/20/1983 | US4422167 Wide-area acousto-optic hydrophone |
| 12/07/1983 | EP0095998A1 Fibre-optical measuring arrangement |
| 12/07/1983 | EP0095876A2 Multi-driver-loudspeaker |
| 12/06/1983 | USRE31459 Solid state force transducer and method of making same |
| 11/29/1983 | US4418248 Dual element headphone |
| 10/25/1983 | US4412105 Laser microphone |
| 10/12/1983 | EP0091303A2 Engine and transmission control system for combines and the like |
| 09/28/1983 | EP0089841A1 Method and apparatus for measuring the intensity of an acoustic field |
| 06/29/1983 | EP0082615A1 Opto-mechanical ripple transducer with adjustable sensitivity |
| 05/24/1983 | US4384394 Method of manufacturing a piezoelectric transducer device |
| 05/10/1983 | CA1146258A1 Sound production using large volume plasmas |
| 12/22/1982 | EP0067790A1 Mixed electroacoustic transducer |
| 12/01/1982 | EP0065911A1 Ionic electro-acoustic transducer |
| 10/20/1982 | EP0063094A1 Tweeter |
| 09/07/1982 | CA1131315A1 Infrared radiation communication system |
| 06/08/1982 | US4334321 Opto-acoustic transducer and telephone receiver |
| 05/05/1982 | EP0050649A1 Speaker with low mass driver |
| 01/12/1982 | US4310905 Acoustical modulator for fiber optic transmission |
| 01/12/1982 | US4310731 Thermal motion transducer |
| 12/29/1981 | US4308603 Ferrofluid transducer |
| 12/29/1981 | US4308431 Speaker with low mass driver |
| 12/22/1981 | CA1114644A1 Solid state force transducer and method of making same |
| 12/15/1981 | US4306120 Sound emitter |
| 12/01/1981 | US4303733 Filament with conductive layers |
| 10/29/1981 | WO1981003100A1 Speaker with low mass driver |
| 08/18/1981 | US4284921 Polymeric piezoelectric transducer with thermoformed protuberances |
| 08/18/1981 | US4284858 Dichroic transducer |
| 06/17/1981 | EP0030262A1 An acousto-optic transducer device |
| 12/30/1980 | US4242541 Composite type acoustic transducer |
| 10/29/1980 | EP0017886A1 Corona-loudspeaker |
| 10/28/1980 | CA1088664A1 Fabrication of semiconductor devices utilizing ion implantation |
| 08/26/1980 | US4219705 Sound production using large volume plasmas |
| 08/06/1980 | EP0013952A1 Filament containing conductive layers, and its use |
| 06/11/1980 | EP0012070A1 Pneumatic speaker with constant fluid flow |
| 04/02/1980 | EP0009295A1 Infrared light communication equipment |
| 03/25/1980 | CA1074236A1 Acoustic speaker system using pulse code modulated signals |
| 03/25/1980 | CA1074144A1 Pressure-electrical signal conversion means |
| 03/18/1980 | US4194095 Fluid flow control speaker system |
| 03/11/1980 | US4193130 Fiber optic hydrophone for use as an underwater electroacoustic standard |
| 09/04/1979 | US4166932 Optical microphone with rectangular fiber optics |
| 07/24/1979 | US4162397 Fiber optic acoustic sensor |
| 07/17/1979 | US4161632 Pneumatic acoustic transducer with ferromagnetic fluid valve |
| 05/30/1979 | EP0002161A2 Piezo-electric transducing device and process for its manufacture |
| 11/14/1978 | US4125820 Stress sensor apparatus |
| 10/24/1978 | US4122337 Pressure-electrical signal conversion means |
| 01/31/1978 | US4071838 Solid state force transducer and method of making same |
| 10/18/1977 | US4054497 Method for electrolytically etching semiconductor material |
| 07/19/1977 | US4037062 Liquid crystal electromechanical transducer |
| 07/12/1977 | US4035823 Stress sensor apparatus |
| 07/05/1977 | US4033787 Fabrication of semiconductor devices utilizing ion implantation |
| 01/11/1977 | US4002897 Opto-acoustic telephone receiver |