Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6091329 | Monitor/hands-free intercom | — | 2000-07-18 |
| 5708970 | Wireless sound monitoring apparatus with subaudible squelch control | Theodore B. Freese, Gary C. Lindenberger | 1998-01-13 |
| 5533959 | Wireless remote monitors employing reassurance tones | Niel P. Zeller, Dwight D. Ifland | 1996-07-09 |