Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5802164 | Systems and methods for controlling telephone sound enhancement on a per call basis | Beth J. Clancy, Richard E. Le Cronier, Dario L. Parola, Roger E. Stone, Nancy Y. Tai | 1998-09-01 |
| 4811378 | Toll fraud control | Kenneth Donald Frantzen | 1989-03-07 |