Issued Patents All Time
Showing 51–54 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4453048 | Arrangement for subscriber line ring testing | William R. Daniels | 1984-06-05 |
| 4331843 | Apparatus for controlling and indicating the integrity of the connection of telephone subscribers to a switching system | Lloyd A. Tarr, John Taylor | 1982-05-25 |
| 4270028 | Digitally activated ringing circuit for generation of AC voltages | — | 1981-05-26 |
| 4243841 | Digitally activated coin control circuit | — | 1981-01-06 |