Patents for H04R 19 - Electrostatic transducers (5,387)
11/1981
11/24/1981US4302634 Spring force biasing means for a capacitance-type electrostatic transducer
11/24/1981US4302633 Electrode plate electret of electro-acoustic transducer and its manufacturing method
11/17/1981US4301492 Pressure-sensing transducer
10/1981
10/29/1981WO1981003100A1 Speaker with low mass driver
09/1981
09/29/1981US4292659 Pressure sensing capacitive transducer
09/15/1981US4289936 Electrostatic transducers
09/09/1981EP0035425A1 Process for producing electromechanic transducers using at least one polymer film, and apparatus for carrying out this process
09/09/1981EP0035318A1 Improvements in electroacoustic transducers
09/08/1981US4288735 Vibrating electret reed voltage generator
09/08/1981CA1108747A1 Spring force biasing means for electroacoustical transducer components
09/01/1981US4287553 Capacitive pressure transducer
08/1981
08/25/1981US4286122 Acoustic electrical conversion device with at least one capacitor electret element connected to an electronic circuit
08/18/1981CA1107382A1 Electret microphone with simplified electrical connections by printed circuit board mounting
07/1981
07/28/1981US4281222 Miniaturized unidirectional electret microphone
07/28/1981US4281221 Condenser microphone
07/14/1981US4278852 Earphone construction
05/1981
05/19/1981US4268725 Electret microphone
04/1981
04/21/1981US4263484 Microphone unit
04/07/1981CA1099015A1 Malfunction detector for a dictation system
03/1981
03/24/1981US4258235 Pressure gradient electret microphone
02/1981
02/10/1981US4250415 Electromechanical transducers
02/03/1981US4249043 Electret transducer backplate, electret transducer and method of making an electret transducer
01/1981
01/21/1981EP0022630A1 Method and apparatus for implanting a charge in an electret foil
01/20/1981US4246449 Electrostatic transducer having optimum sensitivity and damping
01/20/1981US4246448 Electromechanical transducer
01/20/1981CA1094229A1 Electrostatically deformable thin silicon membranes
01/13/1981US4245329 Elongated seismic receiver of continuous structure
11/1980
11/25/1980US4236051 Electret microphone
09/1980
09/30/1980US4225755 Capacitive force transducer
08/1980
08/19/1980CA1084153A1 Temperature-stable electret microphone with embossed, small area, electret
07/1980
07/29/1980US4215249 Method and device for controlling wrinkles in a vibratile diaphragm
07/22/1980CA1082350A1 Electroacoustic transducer with springs forming electrical interconnections as a result of assembly
07/08/1980CA1081349A1 Electromagnetic vibrator
06/1980
06/25/1980EP0012176A1 Electret microphone
06/10/1980US4207442 Driver circuit for electrostatic transducers
03/1980
03/11/1980US4192977 Highly directional ultrasonic electret transducer
02/1980
02/12/1980US4188513 Electret microphone with simplified electrical connections by printed circuit board mounting
12/1979
12/18/1979CA1068445A1 Stable electrets of styrene-type polymers
12/11/1979US4178621 Electromechanical pressure transducer
11/1979
11/27/1979CA1067200A1 Condenser microphone
10/1979
10/09/1979US4170721 Microphone with molded block amplifier electrostatic
08/1979
08/08/1979EP0003387A1 Improved electromechanical pressure transducer
07/1979
07/10/1979US4160882 Double diaphragm electrostatic transducer each diaphragm comprising two plastic sheets having different charge carrying characteristics
07/10/1979US4160881 Electret transducers: acoustically transparent backplate of sintered conductive spheres and a thin electret coating; meshlike diaphragm spacing screen overlays apertured electret backplate with screen junctions overlaying the apertures
06/1979
06/13/1979EP0002363A1 Electret transducer and method of making an electret transducer
06/12/1979CA1056493A1 Electroacoustic transducer
05/1979
05/15/1979US4154541 Printer head assembly
04/1979
04/24/1979US4151480 FET Amplifier with protective circuit
04/24/1979US4151378 Electrostatic microphone with damping to improve omnidirectionality, flatten frequency response, reduce wind noise
04/10/1979US4149095 Monolithic structure for storing electrical charges
02/1979
02/27/1979US4142073 Temperature-stable electret microphone with embossed, small area, electret
10/1978
10/24/1978US4122302 Two way dynamic and electrostatic speaker enclosure with side vent for greater high frequency dispersion
09/1978
09/26/1978US4117275 Non-directional electret microphone with an air passage to balance pressures on opposite sides of the diaphragm
09/26/1978CA1039415A1 Method for producing thermoplastic film electric element
08/1978
08/08/1978US4105877 Electrostatic loudspeaker having elastic diaphragm spacer elements cured in situ
06/1978
06/06/1978US4093884 Thin structures having a piezoelectric effect, devices equipped with such structures and in their methods of manufacture
04/1978
04/18/1978US4085297 Spring force biasing means for electroacoustical transducer components
03/1978
03/28/1978US4081626 Electrostatic transducer having narrowed directional characteristic
01/1978
01/31/1978US4070741 Method of making an electret acoustic transducer
12/1977
12/13/1977US4063050 Acoustic transducer with improved electret assembly
11/1977
11/08/1977US4057660 Method for producing thermoplastic film electric element
10/1977
10/11/1977US4053817 Electromagnetic vibrator
09/1977
09/06/1977US4046974 Electroacoustic transducer with springs forming electrical interconnections as a result of assembly
08/1977
08/16/1977US4042438 Method of assembling a diaphragm assembly for an electro-acoustic transducer
07/1977
07/26/1977US4037310 Method of manufacturing a homopolar electret from a foil
07/19/1977US4037062 Liquid crystal electromechanical transducer
07/05/1977US4034332 Ultrasonic transmitting and receiving devices using dielectric transducers
05/1977
05/24/1977US4025734 Ambient noise shielded ear transceiver
04/1977
04/05/1977US4016375 Vibratory diaphragm of a fluoropolymer
03/1977
03/29/1977US4014091 Method and apparatus for an electret transducer
02/1977
02/01/1977US4006317 Electrostatic transducer and acoustic and electric signal integrator
01/1977
01/04/1977US4001519 Pick-up cartridges for gramophone records
11/1976
11/16/1976US3992585 Self-energizing electrostatic loudspeaker system
11/09/1976US3991285 Microphone having an electrostatic cartridge having a structural electrical resistor
09/1976
09/14/1976US3980838 Plural electret electroacoustic transducer
06/1976
06/15/1976US3963881 Unidirectional condenser microphone
06/01/1976US3961202 Power supply circuit for use with an electrostatic transducer
05/1976
05/25/1976US3958662 Tensioned diaphragm mounting for an electroacoustic transducer
04/1976
04/06/1976US3949178 Electret device having charge maintained by radioactivity
03/1976
03/23/1976US3946422 Electret transducer having an electret of inorganic insulating material
03/23/1976US3945112 Technique for fabrication of foil electret
03/16/1976US3944759 Microphone provided with a cylindrically shaped microphone cartridge
03/16/1976US3944756 Electret microphone
03/02/1976US3942029 Electrostatic transducer
03/02/1976US3941946 Electrostatic transducer assembly
01/1976
01/27/1976US3935397 Electrostatic loudspeaker element
01/06/1976US3931469 Crossover network for a multi-element electrostatic loudspeaker system
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