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)
02/1999
02/03/1999EP0785826B1 Ultrasonic transducer array with apodized elevation focus
02/03/1999EP0738427A4 Ultrasonic transducer with selectable beamwidth and method
02/02/1999US5867450 State switched acoustic transducer
01/1999
01/21/1999DE19727951A1 Vibration system for producing quiet alarm
01/14/1999WO1999001234A2 Ultrasonic transducer
01/13/1999EP0890292A1 Ultrasonic transducers method for fixing ultrasonic transducers and high output power ultrasonic transducers
01/12/1999US5857974 For facilitating providing images from within a cavity
01/07/1999DE19727877A1 Ultraschallwandler Ultrasonic transducer
01/05/1999US5856956 Piezoelectric acoustic transducer
12/1998
12/29/1998US5853514 Method of producing a piezoelectric/electrostrictive film element
12/23/1998WO1998058521A1 Loudspeaker
12/23/1998WO1998058519A2 Ultrasonic transducer for high transduction in gases and method for non-contact ultrasound transmission into solid materials
12/23/1998WO1998058416A1 Loudspeaker assembly
12/22/1998US5852589 Low cost composite transducer
12/16/1998EP0883876A1 Ultrasound transmissive pad
12/10/1998WO1998035529A3 Elastomeric dielectric polymer film sonic actuator
12/09/1998EP0883326A2 Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer
12/09/1998CN1201181A Thin-film loudspeaker used in thin-film video-frequency monitor apparatus
12/02/1998EP0881856A1 Acoustic piezoelectric vibrator and loudspeaker using the same
12/02/1998EP0881624A2 Ultrasonic sensor and its ultrasonic resonator
12/02/1998EP0880870A1 Improved biocompatible transducers
12/02/1998EP0813802B1 Passive acousto-optic modulator
12/01/1998US5844139 Method and apparatus for providing dynamically variable time delays for ultrasound beamformer
11/1998
11/24/1998US5841736 Low voltage piezoelectric transducer and method
11/19/1998WO1998052289A1 Vehicular loudspeaker system
11/19/1998WO1998052068A1 Multifrequency ultrasound probe
11/17/1998US5838805 Piezoelectric transducers
11/10/1998US5835454 Apparatus for making sonic measurements in a fluid filled tank
11/10/1998US5835453 Electrostrictive acoustic projector and polymers used therein
11/05/1998WO1998049866A1 Low voltage piezoelectric transducer and method
11/04/1998EP0874978A1 Pressure wave sensor
11/04/1998EP0874589A1 Modular transducer system
11/04/1998CN1040607C Sound generating device
10/1998
10/28/1998EP0874351A2 Ultrasonic transmitter-receiver
10/28/1998EP0873668A1 Implantable hearing aid
10/28/1998CN1197363A Element for reproducing and/or recording sound
10/28/1998CN1197199A Ultrasonic transmitter-receiver
10/27/1998US5828766 For converting between electrical and acoustic energy
10/27/1998US5828627 Method of and apparatus for producing spherical waves in the ultrasonic range
10/27/1998US5828156 Ultrasonic apparatus
10/21/1998EP0872285A2 Composite transducer with connective backing block
10/21/1998EP0872158A1 Piezoelectric transducers
10/21/1998EP0872157A1 Piezo speaker for improved passenger cabin audio systems
10/21/1998CN1196862A Ultrasonic transducer
10/20/1998US5825902 Spherical piezoelectric speaker
10/20/1998US5825117 Second harmonic imaging transducers
10/14/1998EP0871345A1 Element for reproducing and/or recording sound
10/13/1998US5820549 Modular transducer system
10/08/1998DE19808994A1 Vehicle mounted ultrasonic obstruction sensor
10/07/1998CN1195463A Panel-form microphones
10/07/1998CN1195460A Greetings or like card
10/07/1998CN1195459A Panel-form loudspeakers
10/07/1998CN1195454A Acoustic device
10/06/1998US5818947 Reducing flow-induced resonance in a cavity
09/1998
09/30/1998EP0868108A2 Piezoelectric speaker
09/30/1998CN1194767A Inertial vibrative transducer
09/29/1998US5814920 Piezoelectric/electrostrictive film-type element and method for producing the same
09/29/1998CA2129946C Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof
09/23/1998EP0799097B1 Acoustic transducer shaped as a prestressed ring
09/23/1998EP0769988B1 Wide-band multifrequency acoustic transducer
09/23/1998CN1194087A Ultrasonic transducers method for fixing ultrasonic transducers and high output power ultrasonic transducers
09/17/1998DE19733233C1 Electroacoustic transducer
09/16/1998EP0865157A2 A bulk acoustic wave (BAW) filter
09/16/1998CN1039867C Ultrasonic transducer
09/15/1998US5808967 Acoustic system
09/08/1998US5805726 Piezoelectric full-range loudspeaker
09/08/1998US5804906 Sound generating device
09/08/1998US5802684 Process for producing a vibration angular-velocity sensor
09/02/1998CN1191970A Method and apparatus for providing dynamically variable time delays for ultrasound beamformer
09/01/1998US5802196 Speaker for radiating sound waves in all directions relative to a speaker supporting surface
09/01/1998US5802195 High displacement solid state ferroelectric loudspeaker
08/1998
08/26/1998EP0860095A1 Method for making a sound transducer integrated into an acoustic signal generating card
08/26/1998EP0860004A1 Phased array ultrasound system and method for cardiac ablation
08/25/1998US5797847 Method and apparatus for complex bandpass filtering and decimation in ultrasound beamformer
08/25/1998US5797846 Method to control frame rate in ultrasound imaging
08/19/1998EP0858652A1 Sound and vibration control windows
08/18/1998US5796854 Thin film speaker apparatus for use in a thin film video monitor device
08/18/1998US5796000 Vibration angular-velocity sensor and process for producing it
08/13/1998WO1998035529A2 Elastomeric dielectric polymer film sonic actuator
08/13/1998WO1998023128A3 Miniature silicon condenser microphone
08/11/1998US5792058 Broadband phased array transducer with wide bandwidth, high sensitivity and reduced cross-talk and method for manufacture thereof
08/06/1998WO1998034434A1 Piezoelectric spring element
08/04/1998US5789846 Capacitively coupled ground electrode for piezo-electric film
07/1998
07/22/1998EP0853919A2 A high resolution intravascular ultrasound transducer assembly having a flexible substrate and method for manufacture thereof
07/21/1998US5784340 Piezoelectric acoustic device
07/16/1998WO1998031190A1 Transducer shroud for improved transducer operation in the treatment of waste water
07/16/1998WO1998031189A1 Piezoelectric electroacoustic transducer
07/14/1998US5781646 Flextensional transducer
07/14/1998US5781509 Wide beam array with sharp cutoff
07/14/1998US5780727 Electromechanical transducer
07/09/1998WO1998019140A3 Surface micro-mechanic ultrasonic transducer
07/09/1998DE19757479A1 Method of operating ultrasound image generating device with convertor array
07/08/1998CA2226194A1 A high resolution intravascular ultrasound transducer assembly having a flexible substrate and method for manufacture thereof
07/07/1998US5778079 Skin touch-controlled piezoelectric microphone
07/07/1998US5777419 Surface acoustic wave device with minimized bulk scattering
07/07/1998US5774961 Method of producing piezoelectric/electrostrictive film element
07/02/1998WO1998028942A1 Electroacoustic transducers comprising vibrating panels
07/02/1998DE19756686A1 Complex finite impulse response filter circuit
07/02/1998DE19756024A1 Bundle forming channel for ultrasound image sender
07/02/1998CA2273025A1 Electroacoustic transducers comprising vibrating panels
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