Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6754187 | Performance enhancement system for digital PBX | Brady Barnes, Curtis J. Behun | 2004-06-22 |
| 4331843 | Apparatus for controlling and indicating the integrity of the connection of telephone subscribers to a switching system | John Taylor, John Stewart Young | 1982-05-25 |
| 4201897 | Ringing voltage transfer circuit | John P. Dorth, Robert V. Burns | 1980-05-06 |