Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5034977 | Phase accumulation dual tone multiple frequency generator | Chern-Jsair Chung | 1991-07-23 |
| 5027389 | Self-compensated dual tone multiple frequency generator | Tzu-Ching Chiue | 1991-06-25 |