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