Diaphragm for speaker
US4129195A · kind A · utility
7Cited by
9References
10Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 25, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Oct 25, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/256
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from a metal such as nickel, wherein a layer, such as of aluminum foil, is disposed on a surface of the porous metal to eliminate the gas permeability of the porous metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.