Transmitter for a headphone
USD325578S · kind S · design
66Cited by
1References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.