Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4746912 | Emergency alarm method and system utilizing cross cueing and ranging techniques | Thomas J. Clifford, Jr., Carl E. Schwab | 1988-05-24 |
| 4468656 | Emergency signalling unit and alarm system for rescuing endangered workers | Thomas J. Clifford, Jr. | 1984-08-28 |