| Patents for H04R 7 - Diaphragms for electromechanical transducers; Cones (6,555) |
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| 09/25/1990 | CA1274618A1 Finding the direction of a sound |
| 09/13/1990 | DE3907660A1 Process for the production of a diaphragm made of fully carbon-containing materials for an acoustic unit |
| 09/12/1990 | CN1009611B Vibrating plate loudspeaker |
| 09/05/1990 | EP0385889A1 Piezoelectric unit with a flat supporting surface and elastic holding elements |
| 09/05/1990 | EP0385888A1 Piezoelectric unit with conductive elastic holding elements |
| 09/05/1990 | CN2061748U Waterproof, damp-proof and long life eletret diaphragm |
| 08/27/1990 | CA2010977A1 Piezoelectric capsule with planer hearing and plexible support element |
| 08/27/1990 | CA2010975A1 Piezoelectric capsule with conductive flexible support elements |
| 08/14/1990 | US4949386 Speaker system |
| 08/09/1990 | DE4001059A1 Prepn. of wholly carbon membrane for acoustic use - by calcining mixt. of graphite powder, resin contg. chlorine, monomer or prim. condensate contg. triazine ring, and solvent or plasticiser |
| 07/03/1990 | US4939784 Loudspeaker structure |
| 06/28/1990 | DE3843051A1 Device for the direct conversion of digital signals into sound |
| 06/19/1990 | US4935908 Finding the direction of a sound |
| 06/07/1990 | DE3840705A1 Diaphragma fuer ein akustisches geraet Geraet diaphragm for an acoustic |
| 06/06/1990 | EP0371131A1 Acoustic material |
| 05/23/1990 | EP0369434A2 Speaker damper configuration |
| 05/22/1990 | US4928312 Acoustic transducer |
| 05/17/1990 | WO1990005435A1 Shallow loudspeaker with slotted magnet structure |
| 05/09/1990 | EP0366693A1 Membrane for a loudspeaker |
| 05/08/1990 | US4924504 Audio speaker |
| 05/01/1990 | US4921559 Process of making an acoustic carbon diaphragm |
| 04/25/1990 | CN1041681A Loud-speakers |
| 04/24/1990 | US4919859 Process of making an acoustic carbon diaphragm |
| 04/19/1990 | WO1990004317A1 Electrodynamic transducer structure |
| 04/05/1990 | WO1990003710A1 Membrane with bead |
| 04/05/1990 | WO1990003709A1 Diaphragm system |
| 04/05/1990 | WO1990003708A1 Electrodynamic-fluidic transducer element for pneumatic loudspeaker |
| 04/04/1990 | EP0362068A1 Electrodynamic-fluidic transducer equipment for a pneumatic loudspeaker |
| 04/04/1990 | EP0361487A1 Diaphragm system |
| 03/29/1990 | DE3831867A1 Membran mit sicke Membrane with surround, |
| 03/28/1990 | EP0360061A2 Loudspeaker diaphragm |
| 03/28/1990 | CN1040902A Loudspeaker |
| 03/28/1990 | CN1040901A Loudspeaker |
| 03/28/1990 | CN1040900A Plate-type loudspeaker |
| 03/28/1990 | CN1040899A Vibrating diaphragm of loudspeaker |
| 03/22/1990 | DE3831376A1 Loudspeaker or microphone |
| 02/20/1990 | US4903308 Audio transducer with controlled flexibility diaphragm |
| 02/06/1990 | US4899390 Thin speaker having an enclosure within an open portion and a closed portion |
| 12/20/1989 | CN2049852U Speaker vibration diaphragm |
| 12/14/1989 | WO1989012374A1 Dynamic head of loud speaker |
| 11/29/1989 | CN2048659U 扬声器 Speaker |
| 11/22/1989 | CN2048269U Loud-speaker |
| 11/21/1989 | US4881617 Radially arcuated speaker cone |
| 11/15/1989 | EP0341589A2 Method of and apparatus for manufacturing a crystalline diamond film for use as an acoustic diaphragm |
| 11/09/1989 | DE3841946A1 Loudspeaker device |
| 10/11/1989 | EP0336448A2 Electroacoustic diaphragm and method for making same |
| 09/26/1989 | CA1260133A1 Diaphragm material for acoustical transducer |
| 09/06/1989 | EP0331591A1 Electroacoustic capsule with a piezo-electric diaphragm |
| 08/30/1989 | EP0330423A2 Loudspeaker diaphragm |
| 08/24/1989 | WO1989007876A1 Improved audio transducer with controlled flexibility diaphragm |
| 08/22/1989 | US4860370 Magnetically suspended acoustical speaker |
| 08/08/1989 | US4856071 Planar loudspeaker system |
| 08/08/1989 | US4855093 Applying high shear to carbon, binder mixture; molding |
| 07/27/1989 | DE3800871A1 Wideband sound transducer |
| 07/18/1989 | US4849071 Method of forming a sealed diaphragm on a substrate |
| 07/18/1989 | US4849050 Method of producing a diaphragm on a substrate |
| 07/18/1989 | US4847981 Method for producing a diaphragm for acoustic appliances |
| 07/13/1989 | DE3744614A1 Loudspeaker combination |
| 07/11/1989 | US4847908 Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
| 07/05/1989 | EP0322587A2 Speaker diaphragm |
| 06/15/1989 | DE3740653A1 Wide-band sound transducer system |
| 06/06/1989 | US4837839 Compact speaker assembly with improved low frequency response |
| 06/01/1989 | DE3738325A1 Electroacoustic transducer |
| 05/09/1989 | US4829581 Electrodynamic transducer comprising a two-part diaphragm |
| 05/09/1989 | US4828907 Diaphragm for producing sound |
| 05/03/1989 | EP0313560A1 Membrane system with flexion-resistant rotationally symmetric plate for use as a sound reflecting or receiving element. |
| 05/03/1989 | EP0175737B1 Finding the direction of a sound |
| 05/03/1989 | CN2037132U Flat loudspeaker |
| 04/25/1989 | US4823907 Balloon assembly |
| 04/25/1989 | CA1253085A1 Diaphragm |
| 04/13/1989 | DE3733000A1 Damping elements for multiway diaphragms |
| 04/11/1989 | US4821330 Wide-band loudspeaker having a diaphragm area divided into sub-areas for various frequency ranges |
| 04/11/1989 | US4820952 Film speaker using a piezo-electric element |
| 04/06/1989 | WO1989003160A1 Centering device for speaker diaphragm |
| 03/29/1989 | CN1032094A Acoustic material |
| 03/28/1989 | US4817165 Acoustic speaker device with a diaphragm having a spider web type core |
| 03/28/1989 | US4817152 Stereo system with piezo-electrical film speaker |
| 03/09/1989 | WO1989002207A1 Acoustic material |
| 02/21/1989 | US4807294 Piezoelectric and foam resin sheet speaker |
| 02/21/1989 | US4805729 Speaker enclosure |
| 02/07/1989 | US4803733 Loudspeaker diaphragm mounting system and method |
| 02/07/1989 | US4803242 Diaphragm for loudspeakers |
| 01/26/1989 | WO1989000801A1 Electro-acoustical transducer |
| 01/12/1989 | WO1989000372A1 Membrane for a loudspeaker |
| 01/12/1989 | DE3722832A1 Diaphragm for a loudspeaker |
| 01/05/1989 | DE3720949A1 Membrane (diaphragm) for electroacoustic transducer systems |
| 01/04/1989 | EP0297572A1 Membrane for loudspeaker |
| 12/21/1988 | EP0296139A2 Audio transducer |
| 12/21/1988 | EP0295494A2 Multilayer film for loudspeaker membranes |
| 12/20/1988 | US4792978 Planar loudspeaker system |
| 11/24/1988 | DE3715389A1 Loudspeaker foam diaphragm, composite system |
| 09/14/1988 | EP0281774A2 Loudspeaker |
| 09/13/1988 | US4770918 Diaphragm for producing sound |
| 08/31/1988 | EP0112383B1 Electro-acoustic transducer with diaphragm |
| 08/31/1988 | CN87215838U Polyester film plated with nickel-iron alloy |
| 08/16/1988 | US4764968 Disk diaphragm for a loudspeaker |
| 08/02/1988 | US4761817 Diaphragm structure for a transducer |
| 08/02/1988 | US4761451 Acoustic vibration sheet and polypropylene composition for the same |
| 07/19/1988 | US4758388 Method of manufacturing ceramic vibration plate for speaker |
| 06/28/1988 | US4753969 Carbon fibers, epoxy resin, hardener, montmorillonite adsorber; high rigidity |