Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5251256 | Independent hysteresis apparatus for tone detection | Tain-Shiuann Lin | 1993-10-05 |
| 5222083 | Call progress monitoring | Joseph F. Khouri, Daniel T. Lai | 1993-06-22 |
| 5175769 | Method for time-scale modification of signals | Donald J. Hejna, Jr., Bruce Musicus | 1992-12-29 |
| 4956806 | Method and apparatus for editing source files of differing data formats using an edit tracking file | Daniel T. Lai | 1990-09-11 |