Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837799 | Telephone line communications control system | John R. Prohs, Charles G. Akins, Nicholas Efthyvoulos, Phillip E. Sandilands | 1989-06-06 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837799 | Telephone line communications control system | John R. Prohs, Charles G. Akins, Nicholas Efthyvoulos, Phillip E. Sandilands | 1989-06-06 |