| Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213) |
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| 05/11/1989 | DE3736900A1 Method for producing a piezoelectric transducer element for electroacoustic transducers |
| 05/11/1989 | DE3736896A1 Electroacoustic transducer |
| 05/11/1989 | DE3736895A1 Handset for telecommunication devices |
| 05/03/1989 | EP0313828A2 Acoustic damper |
| 04/25/1989 | US4825116 Transmitter-receiver of ultrasonic distance measuring device |
| 04/25/1989 | US4825115 Ultrasonic transducer and method for fabricating thereof |
| 04/25/1989 | US4823907 Balloon assembly |
| 04/19/1989 | EP0311661A1 Sensor apparatus |
| 04/18/1989 | US4823327 Electroacoustic transducer |
| 04/18/1989 | US4821838 Acoustic damper |
| 04/12/1989 | EP0310605A1 Piezoelectrically operated fluid pump |
| 04/11/1989 | US4821243 Low pressure acoustic reflector for conformal arrays |
| 04/11/1989 | US4820952 Film speaker using a piezo-electric element |
| 04/11/1989 | CA1252558A1 Ultrasonic transducer |
| 03/29/1989 | EP0309147A2 Monolithic piezoelectric bimorph |
| 03/29/1989 | EP0308931A2 Ultrasonic transducer with astigmatic transmission-reception characteristics |
| 03/29/1989 | EP0308899A2 Ultrasonic transducer with astigmatic transmission-reception characteristics |
| 03/28/1989 | US4817152 Stereo system with piezo-electrical film speaker |
| 03/28/1989 | US4816125 Transducers, integrated circuits, zinc oxide films |
| 03/28/1989 | US4815560 Frequency)compensated hearing aid microphone assembly |
| 03/23/1989 | DE3729950A1 Membrane oscillator (diaphragm oscillator) having a piezoelectric drive |
| 03/15/1989 | EP0307300A1 Piezoelectric device using waves with a reduced negative polarity, and its use in extra-corporal lithotripsy, or in the destruction of particular tissues |
| 03/14/1989 | US4812697 Ultrasonic vibrator and a method of controllingly driving same |
| 03/14/1989 | US4811816 Symmetric double phonic diaphragm volume-enhancing device |
| 03/08/1989 | EP0305519A1 Ultrasonic transducer |
| 03/07/1989 | US4810913 Increased sensitivity piezoelectric hydrophones |
| 02/28/1989 | US4809244 Support member for pressure sensor |
| 02/22/1989 | CN2033174U Loudspeaker under water |
| 02/21/1989 | US4807294 Piezoelectric and foam resin sheet speaker |
| 02/07/1989 | US4803671 Sensor for acoustic shockwave pulses |
| 02/07/1989 | US4803392 Strontium titanate or magnesium oxide substrate with lead titanate covering groove openings on substrate |
| 01/26/1989 | WO1989000801A1 Electro-acoustical transducer |
| 01/24/1989 | US4800316 Backing material for the ultrasonic transducer |
| 01/11/1989 | CN1030330A Piezoelectric transducer with multiple sensitive coaxial elements |
| 01/04/1989 | EP0297948A1 Piezoelectric transducer comprising several coaxial sensitive elements |
| 01/04/1989 | EP0297101A1 Flextensional transducers. |
| 01/04/1989 | EP0297100A1 Sonar transducers. |
| 01/03/1989 | US4795935 Ultrasonic transducer |
| 12/27/1988 | US4794295 Acoustic transducer |
| 12/21/1988 | EP0295907A1 Piezoelectric polymer transducers |
| 12/14/1988 | EP0294826A1 Ultrasonic transducer structure |
| 12/13/1988 | US4791620 Tactile hearing aid |
| 12/01/1988 | WO1988009150A1 Ultrasonic imaging array and balloon catheter assembly |
| 11/29/1988 | US4787265 Torsion vibrator |
| 11/23/1988 | EP0292014A2 Piezoelectric transducer with electrodes which adhere well to both ceramic and synthetic materials |
| 11/17/1988 | EP0290557A1 Echography probe with arrangement of piezoelectric elements |
| 11/16/1988 | CN88203821U Multipurpose energy-saving horn with high reliability |
| 11/15/1988 | US4784154 Interference resistant biomedical transducer |
| 11/08/1988 | US4783821 Transducer of silicon nitride covered by zinc oxide film encapsulated in silicon oxide |
| 11/03/1988 | WO1988008605A1 Sensor apparatus |
| 11/02/1988 | EP0289382A1 Generator for elastic pulses with a predetermined desired shape, and its use in medical treatment or diagnosis |
| 11/02/1988 | EP0289207A2 Contact ultrasonic transducer heads |
| 11/02/1988 | EP0288984A2 Low pressure acoustic reflector for conformal arrays |
| 11/01/1988 | US4782469 Ultra-sound sensor |
| 10/25/1988 | US4780860 Beam forming device |
| 10/18/1988 | US4779246 Electro-acoustic transducer |
| 10/18/1988 | US4779020 Ultrasonic transducer |
| 10/05/1988 | EP0285482A1 Multifrequency acoustic transducer, particularly for medical imaging |
| 10/05/1988 | EP0284689A2 Ultrasonic probe |
| 09/28/1988 | EP0283854A1 Ultrasonic probe having ultrasonic propagation medium |
| 09/28/1988 | EP0283823A1 Apparatus for generating and radiating ultrasound, especially for ultrasound therapy |
| 09/27/1988 | US4773140 Phased array transducer construction |
| 09/13/1988 | US4771205 Ultrasound transducer |
| 09/06/1988 | US4768614 Unidirectional enhancer for microphones |
| 08/30/1988 | US4768173 Pressure wave sensing device of the piezoelectric type with continuous structure and a method of manufacturing same |
| 08/30/1988 | US4766671 Forming decomposable material into pattern, stacking with ceramic circuit sheets, sintering, lamination |
| 08/30/1988 | CA1241432A1 End weighted reed sound transducer |
| 08/17/1988 | CN87215134U Piezoceramic pickup |
| 08/16/1988 | US4764907 Underwater transducer |
| 08/16/1988 | CA1240787A1 Transducer device |
| 08/09/1988 | US4762002 Probe array for ultrasonic imaging |
| 07/28/1988 | DE3701470A1 Method for producing a transducer element for electroacoustic transducers |
| 07/28/1988 | DE3701469A1 Method for producing a transducer element for electroacoustic transducers |
| 07/26/1988 | US4759372 Convex array ultrasonic probe |
| 07/05/1988 | US4755975 Piezoelectric transducer for transmitting or receiving ultrasonic waves |
| 07/05/1988 | US4755708 Hydrophone |
| 06/29/1988 | EP0272960A1 Probe for an ultrasonic apparatus with an concave arrangement of piezoelectric elements |
| 06/15/1988 | EP0271395A1 Curved-bar probe for an echograph |
| 06/15/1988 | EP0271394A1 Echographic probe with a modified connection circuit |
| 06/14/1988 | US4751420 Ultrasonic test head |
| 06/14/1988 | US4751419 Piezoelectric oscillation assembly including several individual piezoelectric oscillation devices having a common oscillation plate member |
| 06/14/1988 | US4751418 Electroacoustic transducer |
| 06/14/1988 | US4751014 Underwater transducers |
| 06/08/1988 | EP0270448A1 Probe for an ultrasonic apparatus with a bar composed of piezo-electric elements |
| 06/08/1988 | EP0270447A1 Echographie probe with an arrangement of piezoelectric elements |
| 06/02/1988 | WO1988004125A1 Unidirectional enhancer for microphones |
| 06/02/1988 | WO1988004092A1 Probe with bar of piezoelectric elements for ultrasound apparatus |
| 06/02/1988 | WO1988004091A1 Echography probe with arrangement of piezoelectric elements |
| 06/02/1988 | WO1988004090A1 Echography probe with improved connection circuit |
| 06/02/1988 | WO1988004089A1 Probe provided with a concave arrangement of piezoelectric elements for ultrasound apparatus |
| 06/02/1988 | WO1988004088A1 Probe with curved bar for echography |
| 06/01/1988 | EP0269314A2 Ultrasonic imaging probe assemblies |
| 05/24/1988 | US4746905 Sound producing device |
| 05/18/1988 | EP0267475A1 Ultrasonic sensor |
| 05/18/1988 | CN87210280U Piezoelectric telephone transmitting amplifier |
| 05/18/1988 | CN85100713B Circular cone piezoelectric ear-phone |
| 05/10/1988 | US4743392 Lead-titanium-oxygen, underwater transducer |
| 05/04/1988 | EP0265742A1 Lithotripter with a locating device |
| 05/04/1988 | EP0265679A2 Flexural disk transducer |
| 05/03/1988 | US4742499 Flextensional transducer |