Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5701253 | Isolated current shunt transducer | Robert J. Mayell | 1997-12-23 |
| 5422939 | Parallel off-hook detection for both line-available and phone pick-up detection | Scott C. Swanson | 1995-06-06 |