Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4581733 | Telecommunication exchange | David M. Davidson, John R. Bungard | 1986-04-08 |
| 4566096 | Telephone exchange conference circuit | Michael P. McKenzie | 1986-01-21 |
| 4541088 | Tone generation circuit for automatic PCM-TDM telecommunication exchange | — | 1985-09-10 |