Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5835025 | Portable battery operated power managed event recorder and interrogator system | Charles H. Clark, Henry H. Harjes, Jr. | 1998-11-10 |
| 5446448 | River ice motion detector | Charles H. Clark, David S. Deck | 1995-08-29 |