Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5678205 | Combination head-protective helmet and communications system | — | 1997-10-14 |
| 5640148 | Dual activation alarm system | R. David Lewis, Bruce A. Hefner, Paul D. Hiltman | 1997-06-17 |