Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879996 | Closed circuit breathing apparatus | Van Ness Harwood, Jr., Jeffrey J. Dosch | 1989-11-14 |
| RE31785 | Breathing valve assembly with diaphragm control of the exhaust ports | — | 1985-01-01 |
| 4437462 | Pneumatic head harness | Robert E. Piljay | 1984-03-20 |
| 4253455 | Breathing valve assembly with diaphragm control of the exhaust ports | — | 1981-03-03 |