| Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213) |
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| 08/18/1983 | WO1983002844A1 Convertor for electro-mechanical vibration conversion |
| 08/17/1983 | EP0085997A2 Acoustic transducer |
| 08/16/1983 | US4398325 Process for producing ultrasonic transducers having complex shapes |
| 08/10/1983 | EP0085496A2 Transducer supporting and contacting means |
| 08/10/1983 | EP0085194A1 Electro-acoustical converter |
| 08/09/1983 | US4398116 Transducer for electronic focal scanning in an ultrasound imaging device |
| 08/04/1983 | WO1983002709A1 Ultrasonic transducer |
| 08/02/1983 | US4396909 Frequency generating circuit |
| 08/02/1983 | US4395912 Apparatus for ultrasonic scanning |
| 08/02/1983 | CA1151285A1 Acoustic transducer with a quarter wavelength adaptation layer as a receiver |
| 07/12/1983 | US4392747 Display device structure |
| 07/07/1983 | WO1983002364A1 Piezoelectric loudspeaker coupled with resonant structures |
| 07/05/1983 | US4392244 Automatic transmission and reception control system |
| 07/05/1983 | US4391144 Ultrasonic test probe |
| 06/21/1983 | US4389548 Acoustic transducer |
| 06/21/1983 | US4389123 Electronic alarm watch |
| 06/14/1983 | CA1148276A1 Piezoelectric transducer with polymer element and method of fabrication of said transducer |
| 06/09/1983 | WO1983002030A1 Sound generator |
| 06/07/1983 | CA1147844A1 Piezoelectric transducer made from a polymer material and process for manufacturing same |
| 06/01/1983 | EP0080100A1 Ultrasonic transducer |
| 05/31/1983 | US4386241 Piezoelectric loudspeaker |
| 05/24/1983 | US4384394 Method of manufacturing a piezoelectric transducer device |
| 05/24/1983 | CA1147051A1 Automatic transmission or recording or transmission and reception control system |
| 05/17/1983 | US4384228 Acousto-electric transducer |
| 05/17/1983 | CA1146662A1 Circuit for processing the signals received by a mosaic of ultrasonic transducers in b-mode echography |
| 04/26/1983 | US4381470 Stratified particle absorber |
| 04/06/1983 | EP0075911A1 Loudspeaker, in particular a tweeter |
| 04/05/1983 | US4379212 Electro-acoustic transducer |
| 04/05/1983 | US4379211 Arcuately tensioned piezoelectric diaphragm microphone |
| 03/31/1983 | WO1983001171A1 Loudspeaker, particularly tweeter |
| 03/30/1983 | EP0075302A1 Sensor for measuring distances using ultrasonic echos |
| 03/30/1983 | EP0075273A1 Ultrasonic transducer |
| 03/08/1983 | US4376302 Piezoelectric polymer hydrophone |
| 03/08/1983 | US4376232 Electro-acoustic transducer |
| 03/01/1983 | US4375166 Ultrasound examination apparatus comprising a mosaic of transducers of an electrostrictive material |
| 02/22/1983 | US4374472 Vibration sensor |
| 02/16/1983 | EP0072289A2 Electro-acoustic transducer with intrinsically polarized dielectric capacitor |
| 02/16/1983 | EP0072288A2 Electro-acoustic transducer with piezo-electric polymer |
| 02/16/1983 | EP0071851A1 Piezoelectric three-tone buzzer |
| 02/15/1983 | US4373378 Vibration sensor for an automotive vehicle |
| 02/08/1983 | US4373119 Adjustable transducer |
| 02/08/1983 | US4372173 Resonator force transducer |
| 02/01/1983 | US4371805 Ultrasonic transducer arrangement and method for fabricating same |
| 02/01/1983 | US4370785 Piexoelectric type having a conductive epoxy resin coating |
| 01/19/1983 | EP0069824A1 Method of making contact with the adhesive side of an electrode of an electric device |
| 01/18/1983 | US4369391 Pressure-sensing transducer device having a piezoelectric polymer element and a method of fabrication of said device |
| 01/18/1983 | CA1139845A1 Wireless transmitting and receiving device using an ear microphone |
| 01/11/1983 | US4368401 Transducer plate for piezo-electrical transducers |
| 01/11/1983 | US4368400 Piezoelectric ultrasonic transducer mounted in a housing |
| 01/04/1983 | US4367426 Oxides of lead, lanthanum, zirconium and titanium |
| 01/04/1983 | US4366947 Calibrated gas-metering apparatus |
| 12/28/1982 | US4366406 Ultrasonic transducer for single frequency applications |
| 12/21/1982 | US4364259 Vibration sensor for an automotive vehicle engine |
| 12/14/1982 | US4363993 Piezoelectric electro-mechanical bimorph transducer |
| 11/23/1982 | CA1136260A1 Cds solid state phase insensitive ultrasonic transducer |
| 11/23/1982 | CA1136257A1 Broadly tuned directional transducer |
| 11/16/1982 | US4359767 Ultrasonic array |
| 10/26/1982 | US4356422 Acoustic transducer |
| 10/26/1982 | CA1134492A1 Transmit receive transducer array and ultrasonic imaging system |
| 10/20/1982 | EP0063094A1 Tweeter |
| 10/12/1982 | US4354132 Ultrasonic transducer with a plastic piezoelectric receiving layer and a non plastic transmitting layer |
| 10/12/1982 | US4354131 Sensor with cross-base mounting plate |
| 10/05/1982 | US4352961 Transparent flat panel piezoelectric speaker |
| 09/28/1982 | CA1132707A1 Driving circuit for piezo-electric transducer |
| 09/14/1982 | US4349762 Fiber reinforced piezoelectric bender transducer |
| 09/14/1982 | US4349747 Sound response time switch for flowing current for a predetermined period of time |
| 09/14/1982 | US4348905 Vibration sensor for an automotive vehicle |
| 09/14/1982 | CA1131760A2 Mechanical resonator arrangements |
| 09/07/1982 | US4348079 Acousto-optic device utilizing Fresnel zone plate electrode array |
| 08/31/1982 | US4347593 Piezoceramic tubular element with zero end displacement |
| 08/31/1982 | US4346505 Method of fabricating piezoelectric transducer with polymer element |
| 08/24/1982 | US4345359 Process for manufacturing a piezoelectric transducer made from a polymer material |
| 08/18/1982 | EP0057982A2 Device sensitive to pressure waves |
| 08/17/1982 | US4345118 Quartz tuning fork electro-acoustic transducer |
| 08/11/1982 | EP0057193A1 Apparatus and method for enhancing the frequency response of a loudspeaker |
| 08/10/1982 | CA1129541A1 Sensor device using piezoelectric coating subjected to bending |
| 08/10/1982 | CA1129540A1 Pressure sensitive signal generator using piezoelectric coating |
| 07/28/1982 | EP0056549A2 Electromechanical transducer structure |
| 07/06/1982 | US4337640 Knocking sensor |
| 06/23/1982 | EP0054045A1 Receiver for a multi-element ultrasonic probe echograph. |
| 06/16/1982 | EP0053947A1 Ultrasonic transducer |
| 06/08/1982 | US4334315 Wireless transmitting and receiving systems including ear microphones |
| 06/08/1982 | CA1125049A1 Silicon transducer |
| 06/01/1982 | US4333029 Piezoelectric seismic sensor for intrusion detection |
| 06/01/1982 | CA1124830A1 Piezoelectric speaker |
| 05/19/1982 | EP0051832A1 Piezoelectric ceramic transducer |
| 05/18/1982 | US4330729 Locking support arrangement for a flexible sound-generating diaphragm |
| 05/05/1982 | EP0050791A2 Electrically operated regulating unit |
| 04/28/1982 | EP0050307A2 Resonator force transducer |
| 04/27/1982 | US4326418 Acoustic impedance matching device |
| 04/27/1982 | CA1122692A1 Audio-detector alarm |
| 04/20/1982 | US4326285 Stereo phonograph cartridge |
| 04/20/1982 | US4326274 Transmission system of aerial ultrasonic pulse and ultrasonic transmitter and receiver used in the system |
| 04/13/1982 | US4324142 Circuit for processing the signals received by a mosaic of ultrasonic transducers in B-mode echography |
| 04/13/1982 | CA1121619A1 Circuit means for providing multiple audible signals from an audible tone generator means |
| 04/07/1982 | EP0048900A1 Process for the production of focussing piezoelectric resonators |
| 04/06/1982 | US4323999 Automatic transmission or recording or transmission and reception control system |
| 04/06/1982 | US4323985 Two dimensional acousto-electrical device for storing and processing information |
| 04/06/1982 | US4322877 Method of making piezoelectric polymeric acoustic transducer |
| 04/06/1982 | CA1121504A1 Ultrasonic probe for measuring liquids at high temperature and under high pressure |