Patents for H04R 19 - Electrostatic transducers (5,387)
09/1984
09/25/1984CA1175136A1 Cell assembly for electret transducer
08/1984
08/30/1984WO1984003410A1 Integrated capacitive transducer
08/28/1984CA1173552A1 Electret transducer
08/21/1984US4467394 Three plate silicon-glass-silicon capacitive pressure transducer
08/15/1984EP0115908A2 Transducer
07/1984
07/24/1984US4461931 Frequency response equalizing network for an electrostatic loudspeaker
07/10/1984CA1170758A1 Flexible tape electroacoustic transducer using an electret
07/03/1984US4458161 Electret device
07/03/1984CA1170189A1 Microphone output transmission circuit
06/1984
06/26/1984US4456796 Unidirectional electret microphone
06/19/1984CA1169359A1 Step-up circuit for driving full-range-element electrostatic loudspeakers
05/1984
05/15/1984US4449236 Anti-side tone transmitter
05/09/1984EP0107843A1 Acceleration vibration detector
05/01/1984CA1166767A1 Process for manufacturing electromechanical transducers using at least one polymer film and a device for implementing said process
04/1984
04/26/1984WO1984001683A1 Diaphragm stretching apparatus
04/26/1984WO1984001678A1 Amplifier circuit
04/17/1984US4443666 Electret microphone assembly
04/17/1984CA1165859A1 Electret microphone shield
04/10/1984US4442324 Encapsulated backplate for electret transducers
04/10/1984US4442323 Microphone with vibration cancellation
03/1984
03/27/1984US4439642 High energy ultrasonic transducer
03/27/1984US4439641 Ultrasonic transducer for use in a vibratory environment
03/27/1984CA1164241A1 Capacitive pressure transducer assembly with improved output lead design
03/13/1984US4436648 Electret microphones
03/07/1984EP0102069A2 Vibration analyzing device
02/1984
02/28/1984US4434327 Electret transducer with variable actual air gap
02/21/1984US4432237 Ultrasonic transducer
02/16/1984WO1984000662A1 Electroacoustic transducer
02/14/1984US4430790 Method of making superconducting devices as defined
01/1984
01/31/1984US4429193 Electret transducer with variable effective air gap
01/31/1984US4429192 Electret transducer with variable electret foil thickness
01/31/1984US4429191 Electret transducer with variably charged electret foil
01/31/1984US4429190 Continuous strip electret transducer array
01/31/1984US4429189 Electret transducer with a selectively metalized backplate
01/03/1984US4424419 Electret microphone shield
12/1983
12/28/1983EP0096778A2 Microphone
12/13/1983US4420790 High sensitivity variable capacitance transducer
12/06/1983US4419545 Electret transducer
11/1983
11/29/1983US4418246 Cell assembly for electret transducer
11/15/1983US4415948 Electrostatic bonded, silicon capacitive pressure transducer
11/08/1983US4414433 Microphone output transmission circuit
11/02/1983EP0092822A2 Ear microphone
10/1983
10/11/1983US4409441 Ultrasonic transducer for use in a vibratory environment
10/04/1983US4407852 Volumetric space charge
09/1983
09/13/1983US4403382 Process for manufacturing electromechanical transducers using at least one polymer film
09/06/1983US4403117 Sonic transducer having diaphragm tensioning spring directly attached to diaphragm
08/1983
08/30/1983US4401858 Method for controlling wrinkles in a vibratile diaphragm
08/23/1983US4400634 Bimorph transducer made from polymer material
08/16/1983CA1152205A1 Telephone transmitter including an electret transducer
08/03/1983EP0084608A1 Electrostatic acoustical transducer
07/1983
07/26/1983CA1150816A1 Method and apparatus for implanting a charge in an electret foil
07/19/1983CA1150393A1 Electrostatic transducer backplate having open ended grooves
07/12/1983CA1149928A1 Electrostatic loudspeaker
07/05/1983US4392025 Condenser microphone
06/1983
06/21/1983US4389580 Flexible tape electroacoustic transducer using an electret
05/1983
05/24/1983US4385209 Adjustment of operating characteristics of a telephone transmitter including an electret transducer
05/10/1983US4383139 Electrostatic acoustic converter
05/10/1983US4382328 Method of making stationary electrodes for electrostatic transducers
05/03/1983US4382196 Tape transducer
04/1983
04/27/1983EP0077615A1 Electret microphone shield
04/14/1983WO1983001362A1 Lead-frame for an electret microphone
04/12/1983US4380041 Capacitor pressure transducer with housing
04/12/1983CA1144387A1 Capacitive pressure transducer
03/1983
03/15/1983CA1143049A1 Electrostatic transducer having optimum sensitivity and damping
03/09/1983EP0073682A1 Electroacoustical transducer for use in a vibratory environment and a method of making same
02/1983
02/16/1983EP0072289A2 Electro-acoustic transducer with intrinsically polarized dielectric capacitor
02/09/1983EP0057215A4 Improved step-up circuit for driving full-range-element electrostatic loudspeakers.
02/08/1983CA1141020A1 Electrets from plasma polymerized material
12/1982
12/28/1982US4366494 Josephson junction and a method of making the same
12/21/1982CA1138090A1 Method and device for controlling wrinkles in a vibratile diaphragm
12/15/1982EP0066713A1 An electroacoustical transducer and a method for assembling same
12/01/1982EP0065810A2 Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system
12/01/1982EP0065746A2 Condenser microphone
11/1982
11/30/1982US4361735 Electret microphone circuit
11/30/1982US4360955 Method of making a capacitive force transducer
11/16/1982CA1135829A1 Acoustic electrical conversion device with at least one capacitor electret element connected to an electronic circuit
10/1982
10/26/1982US4356049 Lamination of conductor and dielectric polymer film, pressure deformation with jig
09/1982
09/07/1982US4348711 Method and apparatus for implanting a charge in an electret foil
08/1982
08/17/1982US4345299 Capacitive pressure transducer assembly with improved output lead design
08/17/1982US4344807 For use in electrostatic speaker element
08/11/1982EP0057215A1 Improved step-up circuit for driving full-range-element electrostatic loudspeakers
07/1982
07/27/1982CA1128644A1 Capacitor microphone
07/07/1982EP0055650A1 Circuit for connecting an active microphone, in particular with an electret, to a telephone transmission circuit
06/1982
06/29/1982CA1126851A1 Electret transducer backplate, electret transducer and method of making an electret transducer
05/1982
05/25/1982US4331840 Electret transducer with tapered acoustic chamber
05/11/1982US4329732 Precision capacitance transducer
05/11/1982US4329547 Dual section electret microphone
05/05/1982EP0050649A1 Speaker with low mass driver
04/1982
04/27/1982CA1122722A1 Method of manufacturing an electret device
04/07/1982EP0048902A2 Method for manufacturing electret device and condenser type electro-acoustic transducer having electrets
04/06/1982US4323736 Step-up circuit for driving full-range-element electrostatic loudspeakers
03/1982
03/23/1982US4321432 Electrostatic microphone
03/09/1982CA1119710A1 Electrostatic transducer having narrowed directional characteristic
03/04/1982WO1982000745A1 Back plate for condenser microphone and structure thereof
02/1982
02/18/1982WO1982000559A1 Improved step-up circuit for driving full-range-element electrostatic loudspeakers
02/16/1982US4316062 Electrostatic electroacoustic transducer
02/09/1982CA1118090A1 Electromechanical transducers using an electret
01/1982
01/19/1982US4311881 Electrostatic transducer backplate having open ended grooves
12/1981
12/29/1981US4308431 Speaker with low mass driver
12/16/1981EP0041886A1 Capacitive pressure transducer
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