Head seal for an anti-dust helmet
USD250496S · kind S · design
27Cited by
3References
1Claims
0Family size
Inventors
Key dates
| Filing date | Jan 7, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Dec 12, 1992 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.