Patents for H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213)
09/1991
09/10/1991CA1288612C Support member for pressure sensor
09/03/1991US5045746 Ultrasound array having trapezoidal oscillator elements and a method and apparatus for the manufacture thereof
09/03/1991US5044370 Probe with bar of piezoelectric elements for ultrasound apparatus
08/1991
08/27/1991US5042493 Ultrasonic probe and method of manufacturing the same
08/27/1991US5042492 Probe provided with a concave arrangement of piezoelectric elements for ultrasound apparatus
08/21/1991EP0442450A2 Variable origin - variable angle acoustic scanning method and apparatus
08/21/1991CN2083373U Loud-speaker for underwater or in the high-humidity air
08/15/1991WO1991012093A1 Method and device for generating an ultrasonic wave
08/15/1991CA2075049A1 Method and device for generating and ultrasonic wave
08/14/1991EP0440655A1 Ultrasonic transducer comprising at least one row of ultrasonic elements.
08/06/1991US5038068 Thin film pattern and method of forming the same
08/06/1991US5038067 Acoustic transducer
07/1991
07/31/1991EP0438623A1 Calibrating or test method for a piezoceramic transducer used as a soundreceiver and transmitter
07/30/1991US5035247 Sensor for non-invasive measurement of sound, pressure and vibration on the human body
07/17/1991EP0437145A1 Piezoelectric transducer
07/11/1991WO1991010334A1 Acoustic transducer and method of making the same
07/10/1991EP0435914A1 Loudspeaker
07/09/1991US5031222 Piezoelectric speaker
07/09/1991US5030872 Electro-acoustic transducer
07/02/1991US5029148 Flextensional
07/02/1991US5027822 Echography probe with improved connection circuit
06/1991
06/27/1991WO1991007741A3 Resonance oscillator
06/25/1991US5025766 Fuel injection valve and fuel supply system equipped therewith for internal combustion engines
06/25/1991US5025666 Transducer with built-in printed circuit board
06/20/1991DE3941749A1 Piezoelectric transducers having increased sensitivity - series connects transducers on plastic base layer to minimise support coupling
06/19/1991EP0432558A2 Piezoelectric transducer unit for telephone sets
06/19/1991EP0432546A2 Piezoelectric transducer unit for telephone sets
06/12/1991EP0431343A2 Audible tag for magnetic electronic article surveillance systems
06/11/1991US5023504 Piezo-electric resonant vibrator for selective call receiver
06/11/1991US5023503 Super high frequency oscillator/resonator
06/06/1991CA2020952A1 Audible tag for magnetic electronic article surveillance systems
05/1991
05/30/1991WO1991007741A2 Resonance oscillator
05/28/1991CA1284531C Increased sensitivity piezoelectric hydrophones
05/22/1991EP0427901A1 Method of manufacturing a multilayer piezoelectric actuator stack
05/21/1991US5018116 Inter-element mounting for stacked piezoelectric transducers
05/21/1991US5016333 Method for manufacturing piezoelectric polymer transducers
05/16/1991DE4020881A1 Resonanzschwinger Resonance oscillator
05/15/1991EP0426761A1 Acoustic field transducers.
05/14/1991US5016228 Sonar transducers
05/14/1991US5015929 Piezoelectric device with reduced negative waves, and use of said device for extracorporeal lithotrity or for destroying particular tissues
05/14/1991CA1284210C Acoustic transducer
05/08/1991EP0425716A1 Ultrasonic layered transducer with astigmatic sound lobe
05/02/1991EP0424936A2 High-temperature resistant piezoelectric transducer and process for production thereof
05/02/1991EP0424744A1 Ultrasonic inspection apparatus
05/01/1991CN1012543B Piezoelectric transduce with multiple sensitive coaxial elements
04/1991
04/17/1991EP0262145A4 Piezoelectric polymeric film balloon speaker
04/03/1991EP0420190A2 Ultrasonic contact transducer and array
04/03/1991EP0420125A2 Electroacoustic piezoelectric transducer having a broad operating range
04/03/1991EP0419661A1 Electroacoustic converter
03/1991
03/27/1991CA2026053A1 Ultrasonic contact transducer and array
03/05/1991CA1281123C Line array transducer assembly
02/1991
02/26/1991US4996713 Electroacoustic piezoelectric transducer having a broad operating range
02/26/1991CA1280821C Piezoelectric polymeric film balloon speaker
02/12/1991US4992989 Ultrasound probe for medical imaging system
02/12/1991US4992692 Ultrasonic
02/05/1991US4991151 Elastic pulse generator having a desired predetermined wave form
02/05/1991US4990816 Piezoelectric capsule with resilient conducting holding means
01/1991
01/29/1991US4989187 Acoustic apparatus
01/23/1991EP0409007A2 Ultrasonic layered transducer
01/22/1991US4987564 Acoustic apparatus
01/15/1991US4985926 High impedance piezoelectric transducer
01/10/1991WO1991000153A1 Wide-range ultrasonic transducer
01/08/1991US4984222 Piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length
12/1990
12/19/1990EP0402969A2 Pilot circuit for electrodynamic or piezoceramic receiving telephone capsules
12/18/1990US4979219 Piezoelectric speakers
12/18/1990US4978880 Piezoelectric capsule with flat supporting surface and resilient holding means
12/18/1990CA1278082C Pressure wave sensing device of the continuous structure piezoelectric type and method for fabricating said device
12/13/1990WO1990015513A1 Multi-driver loudspeaker system
12/05/1990EP0401027A2 An acoustic transducer
12/04/1990US4974590 Ultrasonic probe for use in ultrasonic endoscope
12/04/1990CA1277414C Broadband longitudinal vibrator transducer
12/02/1990CA2017382A1 Acoustic transducer
11/1990
11/29/1990WO1990014737A1 Piezoceramic transducer for telephone instruments
11/22/1990EP0398212A1 Telephone handset
11/22/1990EP0397959A2 Annular array sensors
11/15/1990DE3915189A1 Piezoelectric crystal device - used as interplanetary telephone
11/06/1990US4969197 Piezoelectric speaker
11/01/1990WO1990012659A1 Electroacoustic converter
11/01/1990WO1990012658A1 Process for manufacturing an acoustic sensor with an essentially non-detachable protective layer, and acoustic sensor so obtained
10/1990
10/30/1990CA1275726C Electroacoustic calling device
10/09/1990US4962332 Ultrasonic probe and method of manufacturing the same
10/03/1990EP0283823B1 Apparatus for generating and radiating ultrasound, especially for ultrasound therapy
10/03/1990CN2063328U Loud-speaker with double shells
09/1990
09/19/1990EP0387299A1 Ic processed piezoelectric microphone
09/18/1990US4957100 Ultrasound generator and emitter
09/18/1990US4957099 Shock wave source for extracorporeal lithotripsy
09/05/1990EP0385889A1 Piezoelectric unit with a flat supporting surface and elastic holding elements
09/05/1990EP0385888A1 Piezoelectric unit with conductive elastic holding elements
08/1990
08/29/1990EP0383972A1 Ultrasonic array with trapezoidal vibration elements, and method and device for its manufacture
08/27/1990CA2010977A1 Piezoelectric capsule with planer hearing and plexible support element
08/27/1990CA2010975A1 Piezoelectric capsule with conductive flexible support elements
08/22/1990EP0383650A1 Process and apparatus for locating and focusing waves
08/22/1990EP0383270A2 Ultrasonic imaging system
08/16/1990EP0381796A1 Ultrasonic sensor
08/14/1990US4949387 Electro-acoustic transducer unit
08/07/1990US4947075 Piezoelectric insert with side electric connection clips
07/1990
07/24/1990US4944017 Electroacoustic insert with added coil
07/04/1990EP0376567A2 Array of ultrasonic transducer
07/04/1990EP0376396A2 Transducer for ultrasonic medical imaging
07/03/1990CA1271247A1 Load and dispersion cell for sound
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