Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D480476 | Filter cartridge for an escape hood | Paul A. Martinson, James R. Betz | 2003-10-07 |
| 6279572 | Protective system for face and respiratory protection | Michael R. Berrigan, Patrick Carey | 2001-08-28 |
| 6250299 | Protective system for face and respiratory protection | Michael R. Berrigan, Patrick Carey | 2001-06-26 |
| 6014971 | Protective system for face and respiratory protection | Michael R. Berrigan, Patrick Carey | 2000-01-18 |