Fan for anti-dust helmet
USD252767S · kind S · design
2Cited by
4References
1Claims
0Family size
Inventors
Key dates
| Filing date | Jan 7, 1977 |
| Grant date | Aug 28, 1979 |
| Priority date | — |
| Expiry date | Aug 28, 1993 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.