Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4647787 | Backup battery power supply for microprocessor based telephones | — | 1987-03-03 |
| 4634814 | Surge protected electronic switch for telephone voiceband circuits | — | 1987-01-06 |
| 4613768 | Temperature dependent, voltage reference comparator/diode | — | 1986-09-23 |
| 4609864 | Analog process controller with digital monitor | — | 1986-09-02 |
| 4598174 | Circuit for detecting keypad conditions in a microprocessor controlled telephone instrument | — | 1986-07-01 |
| 4532382 | Power supply for telephone equipment memory devices | — | 1985-07-30 |
| 4406927 | Electronic tone ringer | — | 1983-09-27 |