Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5794617 | Face mask and retainer | Robert A. Brunell | 1998-08-18 |
| 5373869 | Test probe for face piece respirators | — | 1994-12-20 |
| 5299448 | Positive pressure test apparatus for facepiece respirator | Richard D. Maryyanek, Keith Simpson | 1994-04-05 |
| D340316 | Test probe for facepiece respirators | — | 1993-10-12 |
| D287649 | Disposable respirator | Joseph Maisano, James J. Krusas | 1987-01-06 |
| D286213 | Dual filter respirator | Richard D. Maryyanek | 1986-10-14 |
| 4600002 | Disposable respirator | Richard D. Maryyanek | 1986-07-15 |
| 4592350 | Respirator | Richard D. Maryyanek | 1986-06-03 |
| D270957 | Respirator | Richard D. Maryyanek | 1983-10-11 |