Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4635868 | End of rewind detector for a telephone answering device | — | 1987-01-13 |
| 4584435 | Miniature telephone answering device with single head carriage | — | 1986-04-22 |
| 4472599 | Control circuitry for a tape cassette telephone answering device | — | 1984-09-18 |
| 4426554 | Tape drive transfer system for cassette telephone answering device with remote controlled playout | — | 1984-01-17 |
| 4400581 | Incoming audio detection circuit for a speaker telephone | — | 1983-08-23 |
| 4390751 | End of rewind detection in a telephone answering device having remote playout | — | 1983-06-28 |
| 4390752 | Ring detection circuit for a telephone answering device | — | 1983-06-28 |
| 4389545 | Remote rewind mechanism and control circuitry for a tape cassette telephone answering device | — | 1983-06-21 |
| 4385205 | Single motor drive assembly for a tape cassette telephone answering device | — | 1983-05-24 |
| 4315104 | Automatically reset control mechanism for remote playout telephone answering device | — | 1982-02-09 |
| 4315109 | Electronic ring sounder for a speaker telephone | — | 1982-02-09 |
| 4306117 | Remote recording of new outgoing announcement in a telephone answering device | — | 1981-12-15 |
| 4264785 | Voltage regulator circuitry for a telephone answering device | — | 1981-04-28 |
| 4236044 | Remote playout control mechanism for a telephone answering device | — | 1980-11-25 |
| 4227053 | Telephone answering device having balanced input | — | 1980-10-07 |
| 4213010 | Fail-safe mechanisms for a telephone answering device | — | 1980-07-15 |
| 4201888 | Remote playout telephone answering device | — | 1980-05-06 |
| 4197426 | Remote playout telephone answering device | — | 1980-04-08 |
| 4189623 | Telephone answering device having simplified mechanical controls | — | 1980-02-19 |