Acoustical transformer for coupling sound waves from the diaphragm to the throat of a horn-type loudspeaker
USD249509S · kind S · design
9Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1976 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Sep 19, 1992 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.