Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 7 - Diaphragms for electromechanical transducers; Cones
Patents for H04R 7 - Diaphragms for electromechanical transducers; Cones (6,555)
09/1982
09/28/1982US4351412 Diaphragm for acoustic instruments and method of manufacturing the same
09/28/1982US4351411 Speaker device
09/07/1982US4348342 Method for making electrodynamic loudspeakers having a planar diaphragm of expanded polystyrene
09/07/1982CA1131132A2 Diaphragm for a loudspeaker
09/01/1982EP0059155A1 Loudspeaker, in particular dome loudspeaker
08/1982
08/31/1982CA1130911A1 Loudspeaker
08/31/1982CA1130910A1 Electro-acoustic transducer
08/18/1982EP0057704A1 Improvements in electroacoustic transducer diaphragms
08/17/1982US4344503 Diaphragm for electro-acoustic transducer
08/10/1982US4343376 Made from a mixture of post-chlorinated polyvinyl chloride and graphite
07/1982
07/27/1982US4341838 Thermoplastic resin mixed with flaky graphite and carbon black
07/27/1982CA1128423A1 Boron cantilever and method of making the same
07/14/1982EP0055841A1 Electrodynamic loudspeaker with diaphragm in the form of a dome
06/1982
06/29/1982CA1126851A1 Electret transducer backplate, electret transducer and method of making an electret transducer
06/22/1982US4336425 High frequency compression driver and method of manufacture thereof
06/09/1982EP0053498A2 Polyester laminated film
06/01/1982CA1124830A1 Piezoelectric speaker
06/01/1982CA1124654A1 Diaphragm for a loudspeaker
05/1982
05/18/1982US4330878 Sound producing device for watches
05/04/1982CA1123091A1 Laminated loudspeaker diaphragm with honeycomb core and damping layers
04/1982
04/13/1982US4324312 Diaphragm suspension construction
03/1982
03/30/1982US4322583 Voice coil bobbin connection to loudspeaker diaphragm of honeycomb core sandwiched by sheets
03/23/1982US4321434 Electroacoustic transducer
03/16/1982US4320264 Loudspeaker with a heat resistant two-part diaphragm
03/09/1982US4319098 Loudspeaker having a unitary mechanical-acoustic diaphragm termination
03/09/1982CA1119710A1 Electrostatic transducer having narrowed directional characteristic
03/04/1982WO1982000744A1 Improvements in electroacoustic transducer diaphragms
02/1982
02/16/1982US4315557 Diaphragm for electro-acoustic transducer
02/10/1982EP0045462A2 Resonant and/or vibrating body for sound generators
02/09/1982US4315112 Speaker
01/1982
01/26/1982US4313040 Electro-acoustic transducer with free edge diaphragm
12/1981
12/29/1981US4308094 Diaphragm for speaker and method of producing same
11/1981
11/24/1981US4302695 Support arrangement for a flexible sound generating diaphragm
11/17/1981US4300655 Acoustic diaphragm for speakers and method of producing the same
10/1981
10/13/1981CA1110752A1 Electro-acoustic transducer with variable thickness foam surfaced diaphragm
10/13/1981CA1110751A1 Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate
09/1981
09/29/1981US4292561 Attenuating means for electroacoustic transducer
09/29/1981US4291781 Polyethylene and carbon fibers
09/22/1981US4291205 Laminated loudspeaker diaphragm with honeycomb core and damping layers
09/08/1981CA1108747A1 Spring force biasing means for electroacoustical transducer components
08/1981
08/26/1981EP0034503A1 Improvements in moving coil loudspeakers
08/18/1981US4284167 Sound reproducing device
08/11/1981US4283605 Piezoelectric speaker
07/1981
07/28/1981US4281223 Electro-acoustic transducer
07/23/1981WO1981002072A1 Variable thickness a acoustic diaphragm,voice coil arrangements for electroacoustic transducers
07/15/1981EP0032082A2 Electro acoustic transducer with active dome
07/07/1981CA1104707A1 Loudspeaker having a laminate diaphragm of three layers
07/07/1981CA1104706A1 Dynamic loudspeaker with plastic basket encapsulating front pole plate
06/1981
06/24/1981EP0030758A1 An electrodynamic transducer with a mechanical filter
06/23/1981US4275278 Diaphragm for a loudspeaker
06/23/1981CA1103796A1 Microphone capable of cancelling mechanical generated noise
06/16/1981US4273900 Diaphragm for acoustic equipment
06/09/1981US4272653 Loudspeaker and a method of producing the same
06/02/1981CA1102444A1 Peripherally reinforced laminated loudspeaker diaphragm
05/1981
05/05/1981CA1100665A1 Diaphragm for acoustic equipment
04/1981
04/28/1981US4264789 Voice coil assembly for a speaker
04/07/1981CA1099015A1 Malfunction detector for a dictation system
04/07/1981CA1098774A1 Acoustic diaphragm with polyurethane elastomer coating
03/1981
03/24/1981US4257325 Mouting of a substantially planar diaphragm defining a sound transducer
03/05/1981WO1981000661A1 Reproduction of super low frequencies by bass weight
03/03/1981US4254184 Vibrating member for acoustic transducer and method for manufacturing the same
02/1981
02/24/1981US4252211 Loudspeaker
02/03/1981US4249043 Electret transducer backplate, electret transducer and method of making an electret transducer
01/1981
01/28/1981EP0022937A1 Loudspeaker with a multiple path diaphragm
01/28/1981EP0022867A1 Metal-containing synthetic resin molding material
01/07/1981EP0020622A1 Membrane for electro acoustic transducer
12/1980
12/30/1980CA1092746A1 Speaker diaphragm
12/16/1980US4239944 Supports of inorganic fibers coated with a thermosetting resin and a thermoplastic resin
12/16/1980US4239943 Adjustable dual spider for a loudspeaker
12/16/1980US4239090 High accuracy bass reproducer device
11/1980
11/25/1980US4235302 Loudspeaker
10/1980
10/14/1980US4228327 Electromagnetic type acoustic transducers
10/07/1980CA1087105A1 Speaker diaphragm and method of making the same
09/1980
09/30/1980US4225757 Broad band dynamic loudspeaker
09/30/1980US4225756 Broad band dynamic loudspeaker
09/09/1980US4222119 Multi-purpose radio
09/09/1980US4221773 Blending and carbonizing graphite powder and thermoplastic resin
08/1980
08/05/1980US4216271 Metal foil, aluminum or magnesium later, boron layer, vapor deposition
07/1980
07/29/1980US4215249 Method and device for controlling wrinkles in a vibratile diaphragm
07/24/1980WO1980001486A1 Metal-containing synthetic resin molding material
07/23/1980EP0013492A1 Method of producing tubular boron bodies suitable for use as pick-up cantilevers
06/1980
06/25/1980EP0012608A1 Isodynamic electromagnetic acoustic transducer with stressed diaphragm
06/12/1980WO1980001230A1 Membrane for electro acoustic transducer
05/1980
05/29/1980WO1980001128A1 Electro acoustic transducer
04/1980
04/15/1980US4198550 Peripherally reinforced laminated loudspeaker diaphragm
04/02/1980EP0009351A1 Electro-acoustic transducers
02/1980
02/26/1980US4190746 Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround
02/19/1980US4188711 Method of making broad band dynamic loudspeaker
02/06/1980EP0007436A1 Electro-acoustic transducer with a membrane having a piezoelectric layer
01/1980
01/22/1980US4184563 Planar diaphragm and supporting frame assembly
11/1979
11/06/1979US4173701 Speaker diaphragm molded from poly-biphenol phthalate type resin film
08/1979
08/07/1979US4163876 Electro-acoustic transducer with variable thickness foam surfaced diaphragm
07/1979
07/10/1979US4160883 Acoustic transducer and method of making same
07/10/1979CA1058090A1 Diaphragms for electroacoustic transducers
06/1979
06/26/1979US4159472 Electronic buzzer
06/19/1979US4158756 Dynamic loudspeaker with plastic basket encapsulating front pole plate
06/13/1979EP0002363A1 Electret transducer and method of making an electret transducer
06/12/1979CA1056493A1 Electroacoustic transducer
06/05/1979CA1056048A1 Concave diaphragm for electro-acoustic transducer
05/1979
05/08/1979CA1053945A1 Vibrating membrane horns
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