Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6625269 | Method of monitoring digital line signal in private exchange system | — | 2003-09-23 |
| 6014434 | Method for controlling and processing an incoming call of a line-busy exchange system | — | 2000-01-11 |
| 5754635 | Apparatus and method for receiving multi-channel caller identification data | — | 1998-05-19 |