Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5267305 | Transparent inband signaling | John R. Prohs, Nick Efthyvoulos, Michael J. Little | 1993-11-30 |
| 4907260 | Telephone line communications control system | John R. Prohs, Charles G. Akins, Nicholas Efthyvoulos, Phillip E. Sandilands | 1990-03-06 |
| 4837799 | Telephone line communications control system | John R. Prohs, Charles G. Akins, Nicholas Efthyvoulos, Phillip E. Sandilands | 1989-06-06 |