Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5720280 | Attenuator for use with respirators | Robert J. Mattila, Jerome D. Phillips | 1998-02-24 |
| 5609164 | Method of forming an earplug containment device | James F. Dyrud, Paul E. Olson | 1997-03-11 |
| 5592935 | Positive/negative air pressure adaptor for use with respirators | Robert J. Mattila, Jerome D. Phillips | 1997-01-14 |
| 5195539 | Earplug compression device | James F. Dyrud | 1993-03-23 |