| Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213) |
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| 09/10/1991 | CA1288612C Support member for pressure sensor |
| 09/03/1991 | US5045746 Ultrasound array having trapezoidal oscillator elements and a method and apparatus for the manufacture thereof |
| 09/03/1991 | US5044370 Probe with bar of piezoelectric elements for ultrasound apparatus |
| 08/27/1991 | US5042493 Ultrasonic probe and method of manufacturing the same |
| 08/27/1991 | US5042492 Probe provided with a concave arrangement of piezoelectric elements for ultrasound apparatus |
| 08/21/1991 | EP0442450A2 Variable origin - variable angle acoustic scanning method and apparatus |
| 08/21/1991 | CN2083373U Loud-speaker for underwater or in the high-humidity air |
| 08/15/1991 | WO1991012093A1 Method and device for generating an ultrasonic wave |
| 08/15/1991 | CA2075049A1 Method and device for generating and ultrasonic wave |
| 08/14/1991 | EP0440655A1 Ultrasonic transducer comprising at least one row of ultrasonic elements. |
| 08/06/1991 | US5038068 Thin film pattern and method of forming the same |
| 08/06/1991 | US5038067 Acoustic transducer |
| 07/31/1991 | EP0438623A1 Calibrating or test method for a piezoceramic transducer used as a soundreceiver and transmitter |
| 07/30/1991 | US5035247 Sensor for non-invasive measurement of sound, pressure and vibration on the human body |
| 07/17/1991 | EP0437145A1 Piezoelectric transducer |
| 07/11/1991 | WO1991010334A1 Acoustic transducer and method of making the same |
| 07/10/1991 | EP0435914A1 Loudspeaker |
| 07/09/1991 | US5031222 Piezoelectric speaker |
| 07/09/1991 | US5030872 Electro-acoustic transducer |
| 07/02/1991 | US5029148 Flextensional |
| 07/02/1991 | US5027822 Echography probe with improved connection circuit |
| 06/27/1991 | WO1991007741A3 Resonance oscillator |
| 06/25/1991 | US5025766 Fuel injection valve and fuel supply system equipped therewith for internal combustion engines |
| 06/25/1991 | US5025666 Transducer with built-in printed circuit board |
| 06/20/1991 | DE3941749A1 Piezoelectric transducers having increased sensitivity - series connects transducers on plastic base layer to minimise support coupling |
| 06/19/1991 | EP0432558A2 Piezoelectric transducer unit for telephone sets |
| 06/19/1991 | EP0432546A2 Piezoelectric transducer unit for telephone sets |
| 06/12/1991 | EP0431343A2 Audible tag for magnetic electronic article surveillance systems |
| 06/11/1991 | US5023504 Piezo-electric resonant vibrator for selective call receiver |
| 06/11/1991 | US5023503 Super high frequency oscillator/resonator |
| 06/06/1991 | CA2020952A1 Audible tag for magnetic electronic article surveillance systems |
| 05/30/1991 | WO1991007741A2 Resonance oscillator |
| 05/28/1991 | CA1284531C Increased sensitivity piezoelectric hydrophones |
| 05/22/1991 | EP0427901A1 Method of manufacturing a multilayer piezoelectric actuator stack |
| 05/21/1991 | US5018116 Inter-element mounting for stacked piezoelectric transducers |
| 05/21/1991 | US5016333 Method for manufacturing piezoelectric polymer transducers |
| 05/16/1991 | DE4020881A1 Resonanzschwinger Resonance oscillator |
| 05/15/1991 | EP0426761A1 Acoustic field transducers. |
| 05/14/1991 | US5016228 Sonar transducers |
| 05/14/1991 | US5015929 Piezoelectric device with reduced negative waves, and use of said device for extracorporeal lithotrity or for destroying particular tissues |
| 05/14/1991 | CA1284210C Acoustic transducer |
| 05/08/1991 | EP0425716A1 Ultrasonic layered transducer with astigmatic sound lobe |
| 05/02/1991 | EP0424936A2 High-temperature resistant piezoelectric transducer and process for production thereof |
| 05/02/1991 | EP0424744A1 Ultrasonic inspection apparatus |
| 05/01/1991 | CN1012543B Piezoelectric transduce with multiple sensitive coaxial elements |
| 04/17/1991 | EP0262145A4 Piezoelectric polymeric film balloon speaker |
| 04/03/1991 | EP0420190A2 Ultrasonic contact transducer and array |
| 04/03/1991 | EP0420125A2 Electroacoustic piezoelectric transducer having a broad operating range |
| 04/03/1991 | EP0419661A1 Electroacoustic converter |
| 03/27/1991 | CA2026053A1 Ultrasonic contact transducer and array |
| 03/05/1991 | CA1281123C Line array transducer assembly |
| 02/26/1991 | US4996713 Electroacoustic piezoelectric transducer having a broad operating range |
| 02/26/1991 | CA1280821C Piezoelectric polymeric film balloon speaker |
| 02/12/1991 | US4992989 Ultrasound probe for medical imaging system |
| 02/12/1991 | US4992692 Ultrasonic |
| 02/05/1991 | US4991151 Elastic pulse generator having a desired predetermined wave form |
| 02/05/1991 | US4990816 Piezoelectric capsule with resilient conducting holding means |
| 01/29/1991 | US4989187 Acoustic apparatus |
| 01/23/1991 | EP0409007A2 Ultrasonic layered transducer |
| 01/22/1991 | US4987564 Acoustic apparatus |
| 01/15/1991 | US4985926 High impedance piezoelectric transducer |
| 01/10/1991 | WO1991000153A1 Wide-range ultrasonic transducer |
| 01/08/1991 | US4984222 Piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length |
| 12/19/1990 | EP0402969A2 Pilot circuit for electrodynamic or piezoceramic receiving telephone capsules |
| 12/18/1990 | US4979219 Piezoelectric speakers |
| 12/18/1990 | US4978880 Piezoelectric capsule with flat supporting surface and resilient holding means |
| 12/18/1990 | CA1278082C Pressure wave sensing device of the continuous structure piezoelectric type and method for fabricating said device |
| 12/13/1990 | WO1990015513A1 Multi-driver loudspeaker system |
| 12/05/1990 | EP0401027A2 An acoustic transducer |
| 12/04/1990 | US4974590 Ultrasonic probe for use in ultrasonic endoscope |
| 12/04/1990 | CA1277414C Broadband longitudinal vibrator transducer |
| 12/02/1990 | CA2017382A1 Acoustic transducer |
| 11/29/1990 | WO1990014737A1 Piezoceramic transducer for telephone instruments |
| 11/22/1990 | EP0398212A1 Telephone handset |
| 11/22/1990 | EP0397959A2 Annular array sensors |
| 11/15/1990 | DE3915189A1 Piezoelectric crystal device - used as interplanetary telephone |
| 11/06/1990 | US4969197 Piezoelectric speaker |
| 11/01/1990 | WO1990012659A1 Electroacoustic converter |
| 11/01/1990 | WO1990012658A1 Process for manufacturing an acoustic sensor with an essentially non-detachable protective layer, and acoustic sensor so obtained |
| 10/30/1990 | CA1275726C Electroacoustic calling device |
| 10/09/1990 | US4962332 Ultrasonic probe and method of manufacturing the same |
| 10/03/1990 | EP0283823B1 Apparatus for generating and radiating ultrasound, especially for ultrasound therapy |
| 10/03/1990 | CN2063328U Loud-speaker with double shells |
| 09/19/1990 | EP0387299A1 Ic processed piezoelectric microphone |
| 09/18/1990 | US4957100 Ultrasound generator and emitter |
| 09/18/1990 | US4957099 Shock wave source for extracorporeal lithotripsy |
| 09/05/1990 | EP0385889A1 Piezoelectric unit with a flat supporting surface and elastic holding elements |
| 09/05/1990 | EP0385888A1 Piezoelectric unit with conductive elastic holding elements |
| 08/29/1990 | EP0383972A1 Ultrasonic array with trapezoidal vibration elements, and method and device for its manufacture |
| 08/27/1990 | CA2010977A1 Piezoelectric capsule with planer hearing and plexible support element |
| 08/27/1990 | CA2010975A1 Piezoelectric capsule with conductive flexible support elements |
| 08/22/1990 | EP0383650A1 Process and apparatus for locating and focusing waves |
| 08/22/1990 | EP0383270A2 Ultrasonic imaging system |
| 08/16/1990 | EP0381796A1 Ultrasonic sensor |
| 08/14/1990 | US4949387 Electro-acoustic transducer unit |
| 08/07/1990 | US4947075 Piezoelectric insert with side electric connection clips |
| 07/24/1990 | US4944017 Electroacoustic insert with added coil |
| 07/04/1990 | EP0376567A2 Array of ultrasonic transducer |
| 07/04/1990 | EP0376396A2 Transducer for ultrasonic medical imaging |
| 07/03/1990 | CA1271247A1 Load and dispersion cell for sound |