Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5978459 | Encryption of telephone calling card codes | Kevin McMahon | 1999-11-02 |
| 5566234 | Method for controlling fraudulent telephone calls | Cynthia A. Edge | 1996-10-15 |
| 5537611 | Network management of special service calls | Narayanasamy Rajagopal, Leo Mack, Jim Finucane, Louis G. Gottlieb | 1996-07-16 |