Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5247574 | Adaptive no balance DX signalling circuit | David J. Farrell | 1993-09-21 |
| 5151935 | Programmable universal signaling circuit for a telephone network | David J. Farrell | 1992-09-29 |