| Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213) |
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| 06/20/1990 | EP0373603A2 Ultrasonic probe |
| 06/14/1990 | WO1990006292A1 Process for producing highly crystalline and homogeneous sub-micron doped and undoped piezoelectric ceramic powders with controlled stoichiometry and particle size |
| 06/13/1990 | EP0372583A2 Method of forming thin film elements of an ultrasonic array transducer |
| 06/08/1990 | CA2005036A1 Process for producing highly crystalline and homogeneous sub-micron doped and undoped piezoelectric ceramic powders with controlled stoichiometry and particle size |
| 06/05/1990 | US4932008 Hinge-modified flextensional transducer |
| 05/23/1990 | EP0369127A2 Compound ultrasonar sonar transducer |
| 05/22/1990 | US4928264 Noise-suppressing hydrophones |
| 04/25/1990 | CN1041681A Loud-speakers |
| 04/17/1990 | US4918674 Alarm timepiece |
| 04/17/1990 | US4918666 Tubular piezo-electric sensor with high sensitivity |
| 04/10/1990 | US4916675 Broadband omnidirectional electroacoustic transducer |
| 04/05/1990 | WO1990003711A1 Loudspeaker |
| 04/04/1990 | EP0361757A2 A matching member |
| 04/04/1990 | EP0361249A1 Sound reproduction set for screens |
| 04/03/1990 | US4914565 Oxidation polymerization of sulfur or nitrogen heterocyclic compounds |
| 03/29/1990 | DE3832617A1 Loudspeaker for a digital control signal |
| 03/29/1990 | DE3832616A1 Loudspeaker |
| 03/27/1990 | US4912686 Sensor apparatus |
| 03/27/1990 | US4910838 Method for providing a desired sound field as well as an ultrasonic transducer for carrying out the method |
| 03/07/1990 | CN1040297A Electroacoustic transducer |
| 03/06/1990 | US4907207 Ultrasound transducer having astigmatic transmission/reception characteristic |
| 02/28/1990 | EP0355694A2 Piezoelectric composite transducer for use in ultrasonic probe |
| 02/28/1990 | EP0222813B1 Improvements in or relating to microphones |
| 02/20/1990 | US4901729 Rubber with crosslinking agent; improved contact and sensitivity |
| 02/14/1990 | EP0354520A2 Electroacoustic transducer |
| 02/13/1990 | US4900972 Electrode for piezoelectric composites |
| 02/07/1990 | EP0353711A2 Frame for a test head |
| 02/07/1990 | CN1039517A Piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length |
| 01/25/1990 | WO1990000792A1 Ultrasonic transducer comprising at least one row of ultrasonic elements |
| 01/25/1990 | WO1990000730A1 Acoustic field transducers |
| 01/23/1990 | US4894895 Method of making an ultrasonic probe |
| 01/17/1990 | EP0351285A1 Piezo electric detector with at least two long, sensitive, supple elements |
| 01/17/1990 | EP0351015A2 A method for fabricating a piezoelectric composite transducer |
| 01/16/1990 | US4894811 Outboard-driven flextensional transducer |
| 01/10/1990 | CN1006407B Narrow frequency band supersonic leak detector |
| 01/09/1990 | CA1264371A1 Flexible piezoelectric transducer assembly |
| 12/26/1989 | US4890268 Two-dimensional phased array of ultrasonic transducers |
| 12/20/1989 | EP0346891A2 Ultrasonic probe and method of manufacturing the same |
| 12/14/1989 | DE3818931A1 Loudspeaker box |
| 12/05/1989 | CA1263737A1 Ear microphone utilizing displacement type bone vibration and method of manufacture thereof |
| 11/23/1989 | EP0342874A2 Ultrasound probe for medical imaging system |
| 11/14/1989 | US4881212 Ultrasonic transducer |
| 11/14/1989 | US4880012 Ultrasonic probe |
| 11/07/1989 | US4879698 Piezopolymer actuators |
| 11/02/1989 | WO1989010677A1 Flextensional transducer |
| 10/12/1989 | EP0328564A4 Ultrasonic imaging array and balloon catheter assembly. |
| 10/11/1989 | EP0336860A1 Electroacoustic unit with coil attached |
| 10/11/1989 | EP0336859A1 Piezo-electric unit with lateral electrical connector pincers |
| 10/11/1989 | EP0335878A1 Echography probe with improved connection circuit. |
| 10/10/1989 | CA1262275A1 Extendible sonobuoy apparatus |
| 10/05/1989 | WO1989009531A1 Electro-mechanical transduction apparatus |
| 10/03/1989 | US4870972 Multiple-frequency acoustic transducer, especially for medical imaging |
| 10/03/1989 | US4870867 Crossed linear arrays for ultrasonic medical imaging |
| 09/27/1989 | EP0333738A1 Probe with bar of piezoelectric elements for ultrasound apparatus |
| 09/27/1989 | EP0333737A1 Probe with curved bar for echography |
| 09/26/1989 | US4870691 Load and dispersion cell for sound |
| 09/26/1989 | US4869768 Ultrasonic transducer arrays made from composite piezoelectric materials |
| 09/26/1989 | CA1260603A1 Ultrasound transducer |
| 09/21/1989 | DE3808018A1 Ultrasonic sensor and method for manufacturing it |
| 09/21/1989 | DE3808017A1 Piezoceramic ultrasonic transducer and method for manufacturing it |
| 09/20/1989 | EP0332637A1 Probe provided with a concave arrangement of piezoelectric elements for ultrasound apparatus. |
| 09/12/1989 | US4866683 Integrated acoustic receiver or projector |
| 09/12/1989 | US4866682 Transducer device |
| 09/12/1989 | US4864904 Ultrasonic vibrational cutting apparatus |
| 09/06/1989 | EP0331591A1 Electroacoustic capsule with a piezo-electric diaphragm |
| 09/06/1989 | EP0331548A1 Checking method and apparatus for ultrasonic transducers |
| 09/05/1989 | US4864624 Piezoelectric loudspeaker with thermal protection |
| 09/05/1989 | US4864548 Flextensional transducer |
| 08/23/1989 | EP0328564A1 Ultrasonic imaging array and balloon catheter assembly |
| 08/22/1989 | US4860368 Acoustic transducers with improved frequency response |
| 08/16/1989 | EP0327917A1 Shock wave generator for the non-contacting disintegration of concretions in a body |
| 08/15/1989 | US4858206 Ring-shell projector |
| 08/15/1989 | US4857792 Circular direction vibrator |
| 08/10/1989 | DE3802316A1 Microphone capsule for telephone sets |
| 08/08/1989 | US4855964 Vented-pipe projector |
| 08/02/1989 | EP0325805A2 Recording device for the non-invasive measurement of waves, pressure and vibrations inside a human body humain |
| 07/26/1989 | CN1034267A Narrow frequency band supersonic leak detector |
| 07/19/1989 | CN1034106A Tubular piezo-electric sensor with high sensitivity |
| 07/18/1989 | US4849946 Piezo-electric transducer comprising several coaxial sensitive elements |
| 07/05/1989 | EP0323305A1 High-sensitivity tubular piezo-electric sensor |
| 07/05/1989 | EP0322686A2 Acoustic apparatus |
| 07/05/1989 | EP0322679A2 Acoustic apparatus |
| 07/05/1989 | CN1033729A Acoustic emission transducer and electrical oscillator |
| 07/04/1989 | US4845776 Piezoelectric transducer and transformer circuit |
| 07/04/1989 | US4845760 Electro-acoustic transducer arranged within the handset of a telephone instrument |
| 07/04/1989 | US4845688 Electro-mechanical transduction apparatus |
| 07/04/1989 | US4844079 Lithotripter comprising locating apparatus |
| 06/29/1989 | DE3743339A1 Electroacoustic transducer, particularly for underwater application |
| 06/27/1989 | US4843275 Air buoyant piezoelectric polymeric film microphone |
| 06/27/1989 | US4841977 Ultra-thin acoustic transducer and balloon catheter using same in imaging array subassembly |
| 06/27/1989 | US4841775 Vibratory transducer |
| 06/21/1989 | CN1033503A Acoustic emission transducer and electrical oscillator |
| 06/20/1989 | US4841493 Electronic acoustic signal emitter |
| 06/15/1989 | WO1989005445A1 An acoustic emission transducer and an electrical oscillator |
| 06/15/1989 | WO1989005199A1 An acoustic emission transducer and an electrical oscillator |
| 06/07/1989 | EP0319010A2 Microphone with frequency pre-emphasis |
| 06/01/1989 | WO1989004881A1 Ic processed piezoelectric microphone |
| 06/01/1989 | DE3739226A1 Method for producing an ultrasonic transducer array |
| 06/01/1989 | DE3738325A1 Electroacoustic transducer |
| 05/18/1989 | WO1989004582A1 Electro-acoustic transducer |