Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D304339 | Telephone network interface apparatus | Thomas J. Collins, Pina Schneider, Thomas Graham | 1989-10-31 |
| 4809323 | Telephone network interface apparatus | Thomas J. Collins | 1989-02-28 |