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)
03/1982
03/23/1982CA1120613A1 Transducer arrangement with integral terminals
03/16/1982US4320366 Carrier frequency communication transmission system having premodulation
02/1982
02/18/1982WO1982000543A1 Apparatus and method for enhancing the frequency response of a loudspeaker
02/09/1982CA1118090A1 Electromechanical transducers using an electret
01/1982
01/19/1982US4310957 Method for the manufacture of ultrasonic heads
01/07/1982WO1982000061A1 Receiver for a multi-element ultrasonic probe echograph and echograph thus equiped
01/06/1982EP0043195A1 Improvements in or relating to ultrasonic transducers
12/1981
12/30/1981EP0042685A1 Transducers
12/29/1981CA1115415A1 Drive circuit for controlling a movable magnetic head
12/16/1981EP0041664A1 Process for the manufacture of an ultrasonic transducer device
12/15/1981CA1114492A1 Piezoelectric high polymer, multilayer electro-acoustic transducers
12/08/1981US4305014 Piezoelectric array using parallel connected elements to form groups which groups are ≈1/2λ in width
12/01/1981US4303733 Filament with conductive layers
12/01/1981CA1113534A1 Piezoelectrically controlled drive system for generating high impact velocities and/or controlled strokes for impact printing
12/01/1981CA1113288A1 Modular piezoelectric transducer component for audible signaling
11/1981
11/25/1981EP0040376A1 Ultrasonic transducer array
11/24/1981US4302695 Support arrangement for a flexible sound generating diaphragm
11/18/1981EP0039986A1 An acoustic transducer system
11/03/1981US4298973 Structure for coupling back cover with case band in wrist watch
10/1981
10/21/1981EP0038043A1 Signal generator for obtaining an acoustic signal
10/20/1981US4296349 Ultrasonic transducer
10/20/1981US4296348 Interdigitated electrode ultrasonic transducer
10/15/1981WO1981002963A1 Device for generating un acoustic signal
10/14/1981EP0037620A1 Acoustic impedance matching device
10/13/1981US4295010 Plural piezoelectric polymer film acoustic transducer
10/13/1981US4295009 Piezoelectric audio transducer mounting and electrical connector
10/06/1981US4293373 Boron dopes, silicon frame, etching
09/1981
09/30/1981EP0036688A1 Device for exploring by the ultrasonic method with a mosaic of transducers produced in an electrostrictive material
09/30/1981EP0036577A1 Ultrasonic transducer array
09/29/1981US4292561 Attenuating means for electroacoustic transducer
09/29/1981CA1109955A1 Method and means for reducing the resonant frequency of a piezoelectric transducer
09/09/1981EP0035426A1 Electromechanic transducer with active suspension and process for its production
09/09/1981EP0035425A1 Process for producing electromechanic transducers using at least one polymer film, and apparatus for carrying out this process
09/09/1981EP0035222A1 Electro-acoustic transducer
09/09/1981EP0035220A1 Electro-acoustic transducer
09/08/1981US4287770 Method for the manufacture of ultrasonic transducers
09/08/1981CA1108745A1 Piezoelectric bimorph or monomorph bender structure
09/02/1981EP0034730A1 Transducer disk for piezo-electric transducers
08/1981
08/18/1981US4284921 Polymeric piezoelectric transducer with thermoformed protuberances
08/18/1981CA1107383A1 Double serrated piezoelectric transducer
08/11/1981US4283605 Piezoelectric speaker
08/04/1981US4282453 Transducer apparatus for detecting airborne pressure pulse
07/1981
07/28/1981US4281241 Firing range
07/15/1981EP0032082A2 Electro acoustic transducer with active dome
07/14/1981US4278851 Piezoelectric buzzer
07/14/1981US4278000 Piezoelectric transducer for electrical string instruments and pickup means comprising the same
07/08/1981EP0031614A1 Curved array of sequenced ultrasound transducers
07/08/1981EP0031510A1 Ultrasonic scanning equipment
07/07/1981US4277712 Acoustic electric transducer with slotted base
07/07/1981US4277711 Acoustic electric transducer with shield of controlled thickness
07/01/1981EP0031049A2 Acoustic transducer
06/1981
06/23/1981CA1103796A1 Microphone capable of cancelling mechanical generated noise
06/09/1981US4272200 Horn loaded piezoelectric matrix printer drive method and apparatus
05/1981
05/19/1981US4268912 Directional hydrophone suitable for flush mounting
04/1981
04/07/1981CA1099015A1 Malfunction detector for a dictation system
04/01/1981EP0025955A1 Piezo-electric ringing transducer
03/1981
03/24/1981US4258229 Body vibration pickup
03/18/1981EP0025376A1 Piezo-electric transducer of polymeric material, and method of producing it
03/18/1981EP0025092A1 Ultrasonic transducer assembly and process for its production
03/17/1981CA1097791A1 Clamped acoustic elastic wave generator
03/17/1981CA1097790A1 Rodent repellor
02/1981
02/10/1981US4250415 Electromechanical transducers
01/1981
01/20/1981US4246447 Piezoelectric transducer drive
01/07/1981EP0021879A1 Pressure sensitive device using a polymeric piezoelectric body and method of manufacture
01/07/1981EP0021534A1 Acoustic transducer
12/1980
12/30/1980US4242541 Composite type acoustic transducer
12/16/1980US4240003 Apparatus and method for suppressing mass/spring mode in acoustic imaging transducers
12/16/1980US4240002 Piezoelectric transducer arrangement with integral terminals and housing
12/02/1980US4237399 Driving circuit for piezo-electric multimorph transducer
11/1980
11/11/1980US4233679 Adjustable piezoelectric transducer for a watch
11/11/1980US4233477 Flexible, shapeable, composite acoustic transducer
11/04/1980US4232241 Electric circuit for driving a piezoelectric vibrator
10/1980
10/28/1980US4229979 Transducer and method of making the same
10/15/1980EP0017216A2 Ultrasonic transducer
10/14/1980US4228532 Piezoelectric transducer
10/14/1980US4228379 Diaphragm type piezoelectric electroacoustic transducer
10/07/1980CA1087004A1 Sound generator
09/1980
09/30/1980US4225856 Circuit means for providing multiple audible signals from an audible tone generator means
09/17/1980EP0015886A1 An improved electro-acoustic transducer element
08/1980
08/26/1980US4219889 Double mass-loaded high power piezo-electric underwater transducer
08/20/1980EP0014693A1 An improved ultrasonic transducer
08/20/1980EP0014647A1 Two-dimensional acousto-electric device for the storing and processing of information
08/12/1980US4217516 Probe for ultrasonic diagnostic apparatus
08/06/1980EP0013952A1 Filament containing conductive layers, and its use
07/1980
07/15/1980US4213071 Oxygen filled, sealed housing for piezoceramic electroacoustic transducer
07/09/1980EP0012938A2 Ultrasonic transducer with optimal lateral resolution and method for its manufacture
06/1980
06/03/1980CA1078917A1 Two-directional fine adjusting device
05/1980
05/20/1980US4204096 Sonic transducer mounting
04/1980
04/29/1980CA1076693A1 Ultrasonic probe
04/08/1980US4196631 Ultrasonic probe for measuring liquids at high temperature and under high pressure
03/1980
03/25/1980US4195284 Sound generator
03/25/1980US4195244 Cadium sulfide
03/25/1980CA1074435A1 Ultrasonic generator
03/18/1980US4194094 Device for mechanically recording a signal having a bandwidth of several MHz, particularly for a video disc
03/18/1980US4193647 Piezoelectric ceramic transducers with uniform resonant frequency
03/18/1980CA1074003A1 Acoustic transducer with a dual purpose piezoelectric element
03/04/1980US4191904 Electroacoustic transducers of the flexural resonant vibratile type
02/1980
02/26/1980US4190784 Piezoelectric electroacoustic transducers of the bi-laminar flexural vibrating type
02/26/1980US4190783 Electroacoustic transducers of the bi-laminar flexural vibrating type with an acoustic delay line
02/26/1980US4190782 Piezoelectric ceramic resonant transducer with stable frequency
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