Speaker
US4993511A · kind A · utility
17Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jan 23, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker including a speaker unit, a speaker frame for supporting the speaker unit and a grille unit for covering the speaker frame. The grille unit is bolted to the speaker frame by bolts, and the grille unit includes flaps for covering head portions of the bolts used for bolting the grille unit to the speaker frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.