Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4653046 | Single channel subscriber carrier system | Gary L. Eisenhauer | 1987-03-24 |
| 4431875 | Signalling and channel loop test circuits for station carrier telephone system | — | 1984-02-14 |
| 4403115 | Station identification circuit arrangement | — | 1983-09-06 |
| 4380688 | Telephone ringing range extender | — | 1983-04-19 |
| 4331838 | Telephone ringer isolator circuit arrangement | — | 1982-05-25 |
| 4324953 | Four-party automatic number identification circuit arrangements | — | 1982-04-13 |
| 4230910 | Signalling and channel loop test circuits for station carrier telephone system | — | 1980-10-28 |
| 4210779 | Amplitude modulated telephone carrier system and terminal equipment therefor | — | 1980-07-01 |
| 4209667 | Subscriber drop-connected circuits | — | 1980-06-24 |
| 4202024 | Repeater bypass protection apparatus | — | 1980-05-06 |