Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5411057 | Detachable inhalation valve device for a respirator filter assembly | — | 1995-05-02 |
| 5036844 | Cover assembly and pre-filter for a respirator | John W. Monsted | 1991-08-06 |
| 5033507 | Filter cover assembly for a respirator | — | 1991-07-23 |