Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7188622 | Filtering face mask that has a resilient seal surface in its exhalation valve | Philip G. Martin | 2007-03-13 |
| 7028689 | Filtering face mask that uses an exhalation valve that has a multi-layered flexible flap | Philip G. Martin | 2006-04-18 |
| 7013895 | Exhalation and inhalation valves that have a multi-layered flexible flap | Philip G. Martin | 2006-03-21 |
| 6332465 | Face masks having an elastic and polyolefin thermoplastic band attached thereto by heat and pressure | Daniel C. Casar | 2001-12-25 |