| Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213) |
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| 01/15/1985 | US4494032 Transducer plate for electro-acoustic transducers |
| 01/09/1985 | EP0130709A2 Ultrasonic transducers for medical diagnostic examinations |
| 01/08/1985 | US4492825 Electroacoustic transducer |
| 12/27/1984 | CA1180100A Ultrasonic transmitter-receiver |
| 12/11/1984 | US4488010 Loudspeaker |
| 12/04/1984 | US4486868 Ultrasonic wave conversion apparatus |
| 11/27/1984 | US4485322 Ultrasonic transducer |
| 11/14/1984 | EP0124870A2 Pickup device for picking up vibration transmitted through bones |
| 11/13/1984 | US4482834 Acoustic imaging transducer |
| 10/23/1984 | US4479069 For measuring the air flow resistivity on the Earth's surface |
| 10/02/1984 | US4475014 Acoustical transducer |
| 09/26/1984 | EP0119897A1 Apparatus for holding a piezo-electric diaphragm, method of realizing the same, and an electromechanical transducer using said apparatus |
| 09/25/1984 | US4473721 High-frequency loud speaker |
| 09/19/1984 | EP0118837A2 Ultrasonic transducer |
| 09/12/1984 | EP0118356A1 Electro-acoustic transducer with piezo-electric diaphragm |
| 09/11/1984 | US4471258 Piezoelectric ceramic transducer |
| 09/11/1984 | US4470308 Arc scan ultrasonic imaging system having diverging lens and path-length compensator |
| 09/04/1984 | US4469978 Electrode arrangement for a folded polymer piezoelectric ultrasonic detector |
| 09/04/1984 | US4469920 Piezoelectric film device for conversion between digital electric signals and analog acoustic signals |
| 08/29/1984 | EP0116823A1 Ultrasonic transducer |
| 08/28/1984 | CA1173553A1 Active suspension electromechanical transducer and process for manufacturing same |
| 08/21/1984 | US4467237 Multielement ultrasonic probe and its production process |
| 07/31/1984 | CA1171950A1 Underwater transducer with depth compensation |
| 07/24/1984 | US4462092 Arc scan ultrasonic transducer array |
| 07/24/1984 | US4461930 Acoustic transducer with honeycomb diaphragm |
| 07/24/1984 | US4461179 Device sensitive to pressure waves |
| 07/19/1984 | WO1984002823A1 Method of manufacturing piezoelectric vibrator |
| 07/17/1984 | US4460841 Ultrasonic transducer shading |
| 06/26/1984 | US4456849 Piezoelectric ultrasonic transducer with damped suspension |
| 06/26/1984 | US4456848 Ultrasonic transmitting and receiving device |
| 06/13/1984 | EP0110480A2 Phased array transducer apparatus |
| 06/13/1984 | EP0110378A2 Ultrasonic probe |
| 06/12/1984 | US4454386 Piezoelectric transducer for piezoelectric loud speaker |
| 06/12/1984 | CA1169144A1 Vibration sensor |
| 06/05/1984 | US4453044 Electro-acoustic transducer with plural piezoelectric film |
| 05/30/1984 | EP0109646A1 Pickup device for picking up vibration transmitted through bones |
| 05/29/1984 | US4451710 Precisely stabilized piezoelectric receiver |
| 05/29/1984 | CA1168348A1 Ultrasonic transducer element |
| 05/22/1984 | CA1167664A1 Resonator force transducer |
| 05/15/1984 | US4449019 Piezoelectric loudspeaker |
| 05/02/1984 | EP0107287A2 Ultrasonic beam focusing device with a concave surface and method of manufacturing the same |
| 05/01/1984 | CA1166767A1 Process for manufacturing electromechanical transducers using at least one polymer film and a device for implementing said process |
| 05/01/1984 | CA1166741A1 Narrow-frequency band acoustic transducer |
| 04/25/1984 | EP0106631A1 Ceramic microphone |
| 04/17/1984 | CA1165860A1 Piezoelectric electro-mechanical bimorph transducer |
| 04/10/1984 | CA1165431A1 Acoustic transducer with adjacent piezoelectric polymer films physically connected at their centres |
| 04/04/1984 | EP0104929A2 Annular array ultrasonic transducers |
| 04/04/1984 | EP0104928A2 Ultrasonic diagnostic imaging systems for varying depths of field |
| 04/04/1984 | EP0104457A2 Piezoelectric transducer |
| 04/03/1984 | US4440983 Electro-acoustic transducer with active dome |
| 04/03/1984 | US4440025 Arc scan transducer array having a diverging lens |
| 03/27/1984 | US4439640 Piezoelectric loudspeaker |
| 03/20/1984 | CA1164084A1 Ultrasonic holography imaging device having a macromolecular piezoelectric element as a transducer |
| 03/13/1984 | US4437033 Ultrasonic transducer matrix having filler material with different acoustical impedance |
| 03/13/1984 | US4437032 Sensor for distance measurement by ultrasound |
| 02/16/1984 | WO1984000662A1 Electroacoustic transducer |
| 02/14/1984 | US4431934 Electrically actuated piezoelectric control element |
| 02/14/1984 | US4431873 Diaphragm design for a bender type acoustic sensor |
| 02/14/1984 | CA1162288A1 Transducer device having a piezoelectric polymer element and a method of fabrication of said device |
| 02/07/1984 | US4430593 Acoustic transducer |
| 02/07/1984 | US4430529 Piezoelectric loudspeaker |
| 01/31/1984 | US4429247 Piezoelectric transducer supporting and contacting means |
| 01/17/1984 | CA1160731A1 Resonators for acceleration environments |
| 01/17/1984 | CA1160730A1 Piezoelectric audible sound generator |
| 01/11/1984 | EP0098017A2 End weighted reed sound transducer |
| 01/10/1984 | US4425525 Ultrasonic transducer array shading |
| 01/10/1984 | US4425500 Firing range |
| 01/03/1984 | CA1159947A1 Ultrasonic array |
| 12/20/1983 | CA1159119A1 Piezoelectric tuning fork |
| 12/20/1983 | CA1158987A1 Electro-acoustic transducer with active dome |
| 12/13/1983 | US4420706 Connector assembly for a piezoelectric transducer |
| 12/06/1983 | US4419599 Polyvinylidene fluoride film |
| 11/30/1983 | EP0094971A1 Sound generator |
| 11/29/1983 | CA1157966A1 Method for manufacturing an ultrasonic transducer |
| 11/15/1983 | CA1157142A1 Diaphragm design for a bender type acoustic sensor |
| 11/15/1983 | CA1157140A1 Ultrasound examination apparatus comprising a mosaic of transducers of an electrostrictive material |
| 11/08/1983 | US4414436 Narrow-frequency band acoustic transducer |
| 11/08/1983 | CA1156750A1 Acousto-optic device utilizing fresnel zone plate electrode array |
| 11/02/1983 | EP0092956A2 Narrow-frequency band acoustic transducer |
| 11/02/1983 | EP0092822A2 Ear microphone |
| 11/01/1983 | US4413198 Piezoelectric transducer apparatus |
| 11/01/1983 | CA1156345A1 Vibration sensor for an automotive vehicle |
| 10/25/1983 | US4412147 Ultrasonic holography imaging device having a macromolecular piezoelectric element transducer |
| 10/11/1983 | US4409681 Transducer |
| 10/11/1983 | US4409510 Method for providing ultraacoustic transducers of the line curtain or point matrix type and transducers obtained therefrom |
| 10/04/1983 | CA1154862A1 Fiber reinforced piezoelectric bender transducer |
| 10/04/1983 | CA1154861A1 Ultrasonic transducer with a piezoelectric plastic receiving layer |
| 09/27/1983 | US4406967 Ultrasonic probe |
| 09/13/1983 | US4404489 Acoustic transducer with flexible circuit board terminals |
| 09/13/1983 | US4403382 Process for manufacturing electromechanical transducers using at least one polymer film |
| 09/07/1983 | EP0087991A1 Method of manufacturing polymeric piezoelectric films by pressing |
| 09/07/1983 | EP0087908A1 Electro-acoustic calling devices |
| 08/31/1983 | EP0086922A1 Method of production of piezo-electric polymer transducers |
| 08/30/1983 | US4401911 Active suspension piezoelectric polymer transducer |
| 08/30/1983 | US4401909 Grain sensor using a piezoelectric element |
| 08/30/1983 | US4401857 Multiple speaker |
| 08/30/1983 | CA1152729A1 Curved array of sequenced ultrasound transducers |
| 08/24/1983 | EP0086531A1 Apparatus for ultrasonic investigation |
| 08/23/1983 | US4400642 Piezoelectric composite materials |
| 08/23/1983 | US4400634 Bimorph transducer made from polymer material |