Head phone
USD254616S · kind S · design
96Cited by
4References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1977 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Apr 1, 1994 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.