Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |