| Patents for H04R 7 - Diaphragms for electromechanical transducers; Cones (6,555) |
|---|
| 06/22/1988 | EP0272059A2 Loudspeakers and their production |
| 06/15/1988 | EP0270981A2 Loudspeaker |
| 06/14/1988 | US4751419 Piezoelectric oscillation assembly including several individual piezoelectric oscillation devices having a common oscillation plate member |
| 06/01/1988 | DE3640264A1 Loudspeaker |
| 05/04/1988 | CN87210819U Treble and bass loudspeaker |
| 05/04/1988 | CN85103924B Vibrating plate for loudspeakers |
| 04/27/1988 | EP0264830A2 Diaphragm for producing sound |
| 04/21/1988 | WO1988002977A1 Arrangement in loud speakers |
| 04/20/1988 | EP0264131A2 Diaphragm for producing sound |
| 04/14/1988 | DE3634484A1 Transducer plate for piezoelectric transducers |
| 04/06/1988 | EP0262729A1 Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
| 04/06/1988 | EP0262406A2 Electro-acoustic transducer with diaphragm and blank therefor |
| 03/23/1988 | EP0260705A2 Speaker |
| 02/24/1988 | EP0256743A2 Diaphragm for Loudspeakers |
| 02/23/1988 | US4726443 Diaphragm |
| 02/02/1988 | US4723296 Electrodynamic transducer of the isophase or ribbon type |
| 02/02/1988 | US4722517 Mechanical spring having negative spring stiffness useful in an electroacoustic transducer |
| 01/28/1988 | DE3623998A1 Loudspeaker with truncoconical loudspeaker diaphragm which consists of fibre-reinforced plastics and an inner honeycomb |
| 01/14/1988 | WO1988000423A1 Membrane system with flexion-resistant rotationally symmetric plate for use as a sound reflecting or receiving element |
| 01/14/1988 | DE3622558A1 Arrangement with diaphragm for a sound transducer |
| 01/14/1988 | DE3622526A1 Flexurally rigid plate, particularly calotte for a sound transducer |
| 01/12/1988 | CA1231433A1 Ribbon speaker system |
| 01/07/1988 | DE3721068A1 Diaphragm system with rotationally symmetric flexurally stiff diaphragm |
| 12/23/1987 | DE3620557A1 Electroacoustic transducer |
| 12/15/1987 | CA1230410A1 Condenser microphone having resistance against high temperature and radioactive rays |
| 11/24/1987 | US4709392 Dome speaker with a diaphragm having at least one elongated cut-out portion |
| 10/27/1987 | US4703510 Electro-acoustic transducer with diaphragm and blank therefor |
| 10/21/1987 | EP0241667A2 Acoustic vibration sheet and polypropylene composition for the same |
| 10/21/1987 | EP0148893B1 Integrated electroacoustic transducer |
| 10/13/1987 | US4699242 Magnetic speaker |
| 10/07/1987 | CN87100528A Wide-band loudspeaker having diaphragm area divided into sub-areas for various frequency ranges |
| 09/09/1987 | EP0235991A2 Cone loudspeakers |
| 09/08/1987 | US4692942 Electroacoustic transducer with piezoelectric diaphragm |
| 08/20/1987 | DE3605102A1 Process for producing dimensionally stable loudspeaker diaphragms |
| 08/19/1987 | EP0232760A2 Broad band loudspeaker provided with a membrane surface divided into a plurality of parts corresponding to a plurality of frequency bands |
| 08/13/1987 | DE3546548A1 Membrane for sound converters (transducers) |
| 06/30/1987 | CA1223658A1 Focussing apparatus |
| 06/24/1987 | CN85108268A Piezo-electric loudspeaker |
| 06/23/1987 | US4674592 Diaphragm for use in electro-acoustic transducer |
| 06/03/1987 | EP0224087A2 Method of making thin-walled ceramic articles, and a diaphragm for acoustic transducers produced thereby |
| 03/12/1987 | DE3530869A1 Diaphragm for an electro-acoustic reproduction transducer |
| 03/11/1987 | CN85106771A Loud-speaker diaphragm of simple sound reproducer |
| 03/10/1987 | US4648480 Condenser microphone having resistance against high-temperature and radioactive rays |
| 03/10/1987 | CA1219056A1 Integrated electroacoustic transducer |
| 03/03/1987 | US4646874 Loudspeaker diaphragm |
| 01/27/1987 | US4639283 Method for making a diaphragm for an electro-acoustic transducer |
| 01/02/1987 | DE3521845A1 Electrodynamic loudspeaker |
| 12/10/1986 | EP0204386A1 Electrodynamic transducer comprising a two-part diaphragm |
| 12/09/1986 | CA1215164A1 High energy ultrasonic transducer |
| 12/02/1986 | US4626729 Electroacoustic piezoelectric transducers |
| 11/18/1986 | CA1214256A1 Electro-acoustic transducer comprising a diaphragm which is permeable to air |
| 11/05/1986 | EP0200257A1 Electrodynamic transducer of the isophase or ribbon type |
| 11/05/1986 | EP0199737A1 Methods and apparatus for tensioning sheet material |
| 11/04/1986 | US4620606 Loudspeaker of plane diaphragm type |
| 10/29/1986 | CN85103929A Vibrating plate loudspeaker |
| 10/29/1986 | CN85103924A Vibrating plate for loudspeakers |
| 10/21/1986 | CA1213032A1 Electro-acoustic transducer with diaphragm and blank therefor |
| 10/21/1986 | CA1213031A1 Flat-diaphragm transducer and method of manufacturing such a transducer |
| 10/07/1986 | CA1212451A1 Ceramic microphone |
| 09/23/1986 | CA1211833A1 Large-excursion electroacoustic transducer |
| 09/10/1986 | EP0193886A2 Membrane for a plane loudspeaker |
| 08/26/1986 | CA1210338A1 Speaker membrane and process for making same |
| 08/19/1986 | US4607382 Electroacoustic transducer unit with reduced resonant frequency and mechanical spring with negative spring stiffness, preferably used in such a transducer unit |
| 08/12/1986 | US4604792 Method for making electro-acoustic transducer apparatus |
| 07/02/1986 | EP0185833A1 Membrane in plastic materials for loudspeakers |
| 06/17/1986 | US4595801 Coupled dual cone velocity driver speaker |
| 05/27/1986 | US4591672 Loud speaker assembly |
| 05/27/1986 | US4591667 Dome speaker with cut-out portions in the voice coil bobbin |
| 05/20/1986 | US4590332 Phase coherent low frequency speaker |
| 05/13/1986 | CA1204533A1 Rubber material |
| 05/07/1986 | EP0180518A1 Electroacoustic transducer with piezoelectric diaphragm |
| 04/29/1986 | US4585090 Isotrophic loudspeaker |
| 04/16/1986 | CN85201711U Vibration plate for a loudspeaker |
| 04/15/1986 | US4582163 Electro-acoustic transducer with high air permeable diaphragm |
| 04/08/1986 | US4581496 Diaphragm for attenuating harmonic response in an electroacoustic transducer |
| 04/08/1986 | CA1203014A1 Speaker diaphragm |
| 03/27/1986 | WO1986001968A1 Methods and apparatus for tensioning sheet material |
| 03/25/1986 | US4578613 Diaphragm comprising at least one foil of a piezoelectric polymer material |
| 03/18/1986 | US4577069 Electroacoustical transducer |
| 03/11/1986 | CA1201798A1 Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam |
| 03/05/1986 | CN85201746U Loudspeaker with a flat vibrating plate |
| 02/04/1986 | US4568414 Methods and apparatus for tensioning sheet material |
| 01/28/1986 | US4567327 Flat-diaphragm transducer and method of manufacturing such a transducer |
| 01/07/1986 | US4562899 Diaphragm of electroacoustic transducer and method of manufacturing the same |
| 12/17/1985 | US4559418 Ceramic microphone |
| 11/12/1985 | US4552243 Diaphragm material for acoustical transducer |
| 11/05/1985 | US4550797 Loudspeaker diaphragm made of a molded, sintered ceramic body |
| 10/29/1985 | US4550228 Ribbon speaker system |
| 10/15/1985 | US4547631 Large-excursion electroacoustic transducer |
| 10/10/1985 | WO1985004490A1 Finding the direction of a sound |
| 10/01/1985 | US4544805 Plane speaker |
| 08/20/1985 | US4536623 Electro-acoustic transducer with diaphragm and blank therefor |
| 08/06/1985 | US4533795 Integrated electroacoustic transducer |
| 07/30/1985 | US4532383 Electroacoustic transducer having a variable thickness diaphragm |
| 07/30/1985 | US4531608 High frequency compression driver |
| 07/30/1985 | EP0112383A4 Electro-acoustic transducer with diaphragm. |
| 07/24/1985 | EP0148893A1 Integrated electroacoustic transducer. |
| 07/23/1985 | US4530386 Cushion tire |
| 05/21/1985 | US4518642 Fusion of cellulose and polypropylene fibers |
| 05/21/1985 | US4518443 Acoustic diaphragm |