Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886058 | Filter element | Gerald M. Brostrom, Sabrina M. Yard | 1989-12-12 |
| 4883547 | Method of forming a high efficiency respirator | — | 1989-11-28 |
| 4827924 | High efficiency respirator | — | 1989-05-09 |