Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6694014 | Constant impedance digital line interface circuit | — | 2004-02-17 |
| 6301358 | Dual-slope current battery-feed circuit | Robert Chen | 2001-10-09 |
| 6069950 | Dual-limit current-limiting battery-feed circuit for a digital line | — | 2000-05-30 |
| 5854550 | Transformerless digital-line battery feed circuit | — | 1998-12-29 |