Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5653191 | Pressure indicator | Clifford A. Calhoun | 1997-08-05 |
| 5488946 | Emergency breathing device for opening cartridges | Clifford A. Calhoun | 1996-02-06 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5653191 | Pressure indicator | Clifford A. Calhoun | 1997-08-05 |
| 5488946 | Emergency breathing device for opening cartridges | Clifford A. Calhoun | 1996-02-06 |