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| Number | Title | Issue Date |
| 4128138 | Diaphragm for speaker A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from nickel powder wherein a vinyl chloride sheet is disposed on the surface of the porous metal to eliminate the gas permeability of the porous metal.... | 12/05/1978 |
| 4122314 | Loudspeaker having a laminate diaphragm of three layers A loudspeaker having a diaphragm including first and second layers and a core sandwiched between the layers, the core being firmly secured to the inner surface of each layer so as to form a unitary structure therewith, a drive assembly causes the diaphrag... | 10/24/1978 |
| 4076098 | Loudspeaker diaphragm This invention relates to loudspeaker diaphragms and methods of making such diaphragms. It is an object of the invention to improve damping of standing waves formed in a loudspeaker diaphragm. To this end a diaphragm in accordance with the invention is ma... | 02/28/1978 |
| 4042438 | Method of assembling a diaphragm assembly for an electro-acoustic transducer In assembling at least one metal frame in abutting supporting relation to a diaphragm to form a diaphragm assembly for an electro-acoustic transducer, for example, as in a microphone or headphone, the diaphragm, which may be an electret, is formed at leas... | 08/16/1977 |
| 4029171 | Membrane for electroacoustic converter systems A diaphragm having a flat multi-layer body with at least one layer of viscoelastic material.... | 06/14/1977 |
