| Patents for H04R 9 - Transducers of moving-coil, moving-strip, or moving-wire type (11,486) |
|---|
| 11/10/1981 | US4300022 Multi-filar moving coil loudspeaker |
| 10/29/1981 | WO1981003099A1 Electroacoustic converter with electrodynamic action |
| 10/27/1981 | US4297537 Dynamic loudspeaker |
| 10/20/1981 | US4296486 Shielded electromagnetic acoustic transducers |
| 10/13/1981 | US4295011 Linear excursion-constant inductance loudspeaker |
| 10/13/1981 | CA1110752A1 Electro-acoustic transducer with variable thickness foam surfaced diaphragm |
| 10/13/1981 | CA1110751A1 Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate |
| 10/06/1981 | US4293741 Magnet assembly |
| 09/15/1981 | US4289937 Speaker with fine grain ferromagnetic material on center pole or ring |
| 09/03/1981 | WO1981002501A1 Magnetic circuit for an electro-mechanical transducer of a dynamic electricity-type |
| 09/01/1981 | CA1108284A2 Electroacoustical transducer |
| 08/26/1981 | EP0034503A1 Improvements in moving coil loudspeakers |
| 08/18/1981 | US4284167 Sound reproducing device |
| 08/18/1981 | CA1107384A1 Deleterious mechanical vibrations from dynamic loudspeaker offset by additional dynamic device |
| 07/28/1981 | US4281225 Pickup cartridge for reproducing signals recorded on a 45-45 stereophonic record disk |
| 07/28/1981 | US4281223 Electro-acoustic transducer |
| 07/23/1981 | WO1981002072A1 Variable thickness a acoustic diaphragm,voice coil arrangements for electroacoustic transducers |
| 07/21/1981 | CA1105392A1 Pick-up assembly for use in a record player |
| 07/14/1981 | US4278852 Earphone construction |
| 07/07/1981 | CA1104707A1 Loudspeaker having a laminate diaphragm of three layers |
| 07/07/1981 | CA1104706A1 Dynamic loudspeaker with plastic basket encapsulating front pole plate |
| 06/30/1981 | US4276452 Membrane type electro-acoustic transducer |
| 06/30/1981 | US4276449 Speaker or microphone having corrugated diaphragm with conductors thereon |
| 06/24/1981 | EP0030758A1 An electrodynamic transducer with a mechanical filter |
| 06/16/1981 | US4273968 Electroacoustic transducer with magnetic flux directed slantly across a diaphragm |
| 06/16/1981 | US4273967 Stylus for reproducing capacitive videodisc |
| 06/09/1981 | US4272653 Loudspeaker and a method of producing the same |
| 06/09/1981 | US4272652 Moving coil type stereophonic pickup cartridge |
| 06/02/1981 | CA1102444A1 Peripherally reinforced laminated loudspeaker diaphragm |
| 06/02/1981 | CA1102443A1 Support for multi-point magnetic driver loudspeaker |
| 05/28/1981 | WO1981001492A1 Speaker and speaker system |
| 05/27/1981 | EP0029266A1 Magnet system for an electroacoustic transducer |
| 05/05/1981 | CA1100633A1 Reproducing transducer capable of tracking control |
| 04/28/1981 | US4264789 Voice coil assembly for a speaker |
| 04/21/1981 | US4263591 Electric transmission system |
| 04/21/1981 | US4263483 Moving coil pick-up assembly for use in a record player |
| 04/07/1981 | CA1099015A1 Malfunction detector for a dictation system |
| 03/31/1981 | US4259550 Acoustic device with floating vibrating means |
| 03/17/1981 | US4256930 Loudspeaker having improved magnetic assembly |
| 03/17/1981 | US4256198 Urethane foam absorber |
| 03/17/1981 | CA1097806A1 Stylus for reproducing information signals recorded on a recording medium |
| 02/24/1981 | US4252211 Loudspeaker |
| 02/17/1981 | US4251695 Pickup cartridge having means for producing magnetic fields of opposite directions for coil plate |
| 02/03/1981 | US4249225 Magnetic field transducer systems |
| 01/28/1981 | EP0023007A1 Method of making an electrodynamic transducer |
| 01/27/1981 | CA1094678A1 Loudspeakers |
| 01/21/1981 | EP0022544A1 Electrodynamic transducer, in particular for telephonic apparatus |
| 01/20/1981 | US4246446 Moving coil pick-up with coils printed on opposite sides of waver |
| 01/06/1981 | US4243839 Transducer with flux sensing coils |
| 01/06/1981 | US4243838 Stiffness variation device |
| 12/30/1980 | US4242541 Composite type acoustic transducer |
| 12/16/1980 | US4239944 Supports of inorganic fibers coated with a thermosetting resin and a thermoplastic resin |
| 12/16/1980 | US4239943 Adjustable dual spider for a loudspeaker |
| 12/16/1980 | US4239090 High accuracy bass reproducer device |
| 12/09/1980 | US4238646 Pickup cartridge for reproducing signals recorded on a 45--45 stereophonic record disk |
| 12/02/1980 | US4237349 Compact moving-coil pickup of low weight and high quality |
| 11/25/1980 | US4235302 Loudspeaker |
| 11/25/1980 | CA1090086A1 Method for producing a magnet plate for electroacoustic transducers |
| 11/18/1980 | US4234766 Speaker assembly |
| 11/12/1980 | EP0018477A1 Moving coil in magnetic field |
| 11/11/1980 | US4233476 Moving coil type cartridge |
| 11/04/1980 | US4232204 High fidelity loudspeaker |
| 10/28/1980 | US4230907 Dynamic loudspeaker able to be driven at increased steady power |
| 10/14/1980 | US4228327 Electromagnetic type acoustic transducers |
| 09/30/1980 | US4225757 Broad band dynamic loudspeaker |
| 09/30/1980 | US4225756 Broad band dynamic loudspeaker |
| 09/16/1980 | CA1085744A1 Loudspeaker system with heat pipe means |
| 09/03/1980 | EP0015013A1 Universal dome loudspeaker construction element |
| 09/02/1980 | US4220832 Two-way speaker with transformer-coupled split coil |
| 09/02/1980 | US4220341 Pickup |
| 08/19/1980 | US4218591 Phonograph cartridge with very hard metal ceramic frame |
| 07/23/1980 | EP0013419A1 Dynamic transducer comprising a voice coil in an air gap filled with a magnetic fluid |
| 07/08/1980 | US4211898 Headphone with two resonant peaks for simulating loudspeaker reproduction |
| 07/01/1980 | US4210786 Magnetic field structure for planar speaker |
| 07/01/1980 | US4210778 Loudspeaker system with heat pipe |
| 06/25/1980 | EP0012608A1 Isodynamic electromagnetic acoustic transducer with stressed diaphragm |
| 06/24/1980 | US4209670 Moving-coil type pickup cartridge |
| 06/17/1980 | US4208736 Hydrophone having a plurality of directional outputs |
| 06/10/1980 | US4207430 Optical motional feedback |
| 05/29/1980 | WO1980001128A1 Electro acoustic transducer |
| 05/27/1980 | US4205205 Dynamic loudspeaker having magnetic assembly adhesively bonded within a surrounding basket |
| 05/06/1980 | US4201886 Plural concentric moving coil speaker with push-pull voltage follower direct coupling |
| 04/22/1980 | US4199782 Stylus for reproducing capacitive videodisc |
| 04/22/1980 | US4199667 Microphone having means for suppressing structure-borne sounds |
| 04/22/1980 | CA1076033A1 Sound projection system |
| 04/16/1980 | EP0009818A1 Dynamic pick-up cartridge for a record player |
| 04/15/1980 | US4198550 Peripherally reinforced laminated loudspeaker diaphragm |
| 03/04/1980 | US4191863 Support for multi-point magnetic driver loudspeaker |
| 02/19/1980 | US4188711 Method of making broad band dynamic loudspeaker |
| 01/01/1980 | US4181193 Sound projection system |
| 12/25/1979 | US4180710 Adjustably positioned phasing plug |
| 11/27/1979 | US4176249 Deleterious mechanical vibrations from dynamic loudspeaker offset by additional dynamic device |
| 11/27/1979 | CA1067201A1 Low frequency electro-acoustic transducer |
| 11/13/1979 | CA1066400A1 Pickup |
| 10/31/1979 | EP0005037A2 Acoustic speaker |
| 10/02/1979 | CA1063710A1 Electromagnetic transducer |
| 08/21/1979 | US4165448 Loudspeaker with improved voice coil support |
| 08/21/1979 | US4165195 Recirculating ball bearing spline joint |
| 08/07/1979 | US4163876 Electro-acoustic transducer with variable thickness foam surfaced diaphragm |
| 07/17/1979 | US4161631 Pickup cartridge |