Face mask breathing valve
USD413166S · kind S · design
33Cited by
5References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Aug 24, 2013 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.