Headphone
USD331057S · kind S · design
100Cited by
2References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1990 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Nov 17, 2006 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.