Speaker device
US6371241B1 · kind B1 · utility
4Cited by
12References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jan 24, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Jan 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker frame is constructed from dried paper pulp. Features in the speaker frame such as holes or slits are formed by carbonizing corresponding sections in the dried paper pulp and applying shear processing to remove the carbonized material. A carbonizing mold contains protrusions corresponding to the sections in the dried pulp to be carbonized. The result is a high quality speaker frame that is biodegradable and can be produced economically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.