Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7234462 | Speech transmission adaptor for use with a respirator mask | Harold R. Carpenter | 2007-06-26 |
| 6382206 | Speech transmission adaptor for use with a respirator mask | Harold R. Carpenter | 2002-05-07 |