Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 17 - Piezo-electric transducers; Electrostrictive transducers
Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213)
08/1983
08/18/1983WO1983002844A1 Convertor for electro-mechanical vibration conversion
08/17/1983EP0085997A2 Acoustic transducer
08/16/1983US4398325 Process for producing ultrasonic transducers having complex shapes
08/10/1983EP0085496A2 Transducer supporting and contacting means
08/10/1983EP0085194A1 Electro-acoustical converter
08/09/1983US4398116 Transducer for electronic focal scanning in an ultrasound imaging device
08/04/1983WO1983002709A1 Ultrasonic transducer
08/02/1983US4396909 Frequency generating circuit
08/02/1983US4395912 Apparatus for ultrasonic scanning
08/02/1983CA1151285A1 Acoustic transducer with a quarter wavelength adaptation layer as a receiver
07/1983
07/12/1983US4392747 Display device structure
07/07/1983WO1983002364A1 Piezoelectric loudspeaker coupled with resonant structures
07/05/1983US4392244 Automatic transmission and reception control system
07/05/1983US4391144 Ultrasonic test probe
06/1983
06/21/1983US4389548 Acoustic transducer
06/21/1983US4389123 Electronic alarm watch
06/14/1983CA1148276A1 Piezoelectric transducer with polymer element and method of fabrication of said transducer
06/09/1983WO1983002030A1 Sound generator
06/07/1983CA1147844A1 Piezoelectric transducer made from a polymer material and process for manufacturing same
06/01/1983EP0080100A1 Ultrasonic transducer
05/1983
05/31/1983US4386241 Piezoelectric loudspeaker
05/24/1983US4384394 Method of manufacturing a piezoelectric transducer device
05/24/1983CA1147051A1 Automatic transmission or recording or transmission and reception control system
05/17/1983US4384228 Acousto-electric transducer
05/17/1983CA1146662A1 Circuit for processing the signals received by a mosaic of ultrasonic transducers in b-mode echography
04/1983
04/26/1983US4381470 Stratified particle absorber
04/06/1983EP0075911A1 Loudspeaker, in particular a tweeter
04/05/1983US4379212 Electro-acoustic transducer
04/05/1983US4379211 Arcuately tensioned piezoelectric diaphragm microphone
03/1983
03/31/1983WO1983001171A1 Loudspeaker, particularly tweeter
03/30/1983EP0075302A1 Sensor for measuring distances using ultrasonic echos
03/30/1983EP0075273A1 Ultrasonic transducer
03/08/1983US4376302 Piezoelectric polymer hydrophone
03/08/1983US4376232 Electro-acoustic transducer
03/01/1983US4375166 Ultrasound examination apparatus comprising a mosaic of transducers of an electrostrictive material
02/1983
02/22/1983US4374472 Vibration sensor
02/16/1983EP0072289A2 Electro-acoustic transducer with intrinsically polarized dielectric capacitor
02/16/1983EP0072288A2 Electro-acoustic transducer with piezo-electric polymer
02/16/1983EP0071851A1 Piezoelectric three-tone buzzer
02/15/1983US4373378 Vibration sensor for an automotive vehicle
02/08/1983US4373119 Adjustable transducer
02/08/1983US4372173 Resonator force transducer
02/01/1983US4371805 Ultrasonic transducer arrangement and method for fabricating same
02/01/1983US4370785 Piexoelectric type having a conductive epoxy resin coating
01/1983
01/19/1983EP0069824A1 Method of making contact with the adhesive side of an electrode of an electric device
01/18/1983US4369391 Pressure-sensing transducer device having a piezoelectric polymer element and a method of fabrication of said device
01/18/1983CA1139845A1 Wireless transmitting and receiving device using an ear microphone
01/11/1983US4368401 Transducer plate for piezo-electrical transducers
01/11/1983US4368400 Piezoelectric ultrasonic transducer mounted in a housing
01/04/1983US4367426 Oxides of lead, lanthanum, zirconium and titanium
01/04/1983US4366947 Calibrated gas-metering apparatus
12/1982
12/28/1982US4366406 Ultrasonic transducer for single frequency applications
12/21/1982US4364259 Vibration sensor for an automotive vehicle engine
12/14/1982US4363993 Piezoelectric electro-mechanical bimorph transducer
11/1982
11/23/1982CA1136260A1 Cds solid state phase insensitive ultrasonic transducer
11/23/1982CA1136257A1 Broadly tuned directional transducer
11/16/1982US4359767 Ultrasonic array
10/1982
10/26/1982US4356422 Acoustic transducer
10/26/1982CA1134492A1 Transmit receive transducer array and ultrasonic imaging system
10/20/1982EP0063094A1 Tweeter
10/12/1982US4354132 Ultrasonic transducer with a plastic piezoelectric receiving layer and a non plastic transmitting layer
10/12/1982US4354131 Sensor with cross-base mounting plate
10/05/1982US4352961 Transparent flat panel piezoelectric speaker
09/1982
09/28/1982CA1132707A1 Driving circuit for piezo-electric transducer
09/14/1982US4349762 Fiber reinforced piezoelectric bender transducer
09/14/1982US4349747 Sound response time switch for flowing current for a predetermined period of time
09/14/1982US4348905 Vibration sensor for an automotive vehicle
09/14/1982CA1131760A2 Mechanical resonator arrangements
09/07/1982US4348079 Acousto-optic device utilizing Fresnel zone plate electrode array
08/1982
08/31/1982US4347593 Piezoceramic tubular element with zero end displacement
08/31/1982US4346505 Method of fabricating piezoelectric transducer with polymer element
08/24/1982US4345359 Process for manufacturing a piezoelectric transducer made from a polymer material
08/18/1982EP0057982A2 Device sensitive to pressure waves
08/17/1982US4345118 Quartz tuning fork electro-acoustic transducer
08/11/1982EP0057193A1 Apparatus and method for enhancing the frequency response of a loudspeaker
08/10/1982CA1129541A1 Sensor device using piezoelectric coating subjected to bending
08/10/1982CA1129540A1 Pressure sensitive signal generator using piezoelectric coating
07/1982
07/28/1982EP0056549A2 Electromechanical transducer structure
07/06/1982US4337640 Knocking sensor
06/1982
06/23/1982EP0054045A1 Receiver for a multi-element ultrasonic probe echograph.
06/16/1982EP0053947A1 Ultrasonic transducer
06/08/1982US4334315 Wireless transmitting and receiving systems including ear microphones
06/08/1982CA1125049A1 Silicon transducer
06/01/1982US4333029 Piezoelectric seismic sensor for intrusion detection
06/01/1982CA1124830A1 Piezoelectric speaker
05/1982
05/19/1982EP0051832A1 Piezoelectric ceramic transducer
05/18/1982US4330729 Locking support arrangement for a flexible sound-generating diaphragm
05/05/1982EP0050791A2 Electrically operated regulating unit
04/1982
04/28/1982EP0050307A2 Resonator force transducer
04/27/1982US4326418 Acoustic impedance matching device
04/27/1982CA1122692A1 Audio-detector alarm
04/20/1982US4326285 Stereo phonograph cartridge
04/20/1982US4326274 Transmission system of aerial ultrasonic pulse and ultrasonic transmitter and receiver used in the system
04/13/1982US4324142 Circuit for processing the signals received by a mosaic of ultrasonic transducers in B-mode echography
04/13/1982CA1121619A1 Circuit means for providing multiple audible signals from an audible tone generator means
04/07/1982EP0048900A1 Process for the production of focussing piezoelectric resonators
04/06/1982US4323999 Automatic transmission or recording or transmission and reception control system
04/06/1982US4323985 Two dimensional acousto-electrical device for storing and processing information
04/06/1982US4322877 Method of making piezoelectric polymeric acoustic transducer
04/06/1982CA1121504A1 Ultrasonic probe for measuring liquids at high temperature and under high pressure
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