Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4330687 | Audio and full duplex digital data carrier system | David K. Worthington, John E. Trombly | 1982-05-18 |
| 4302629 | Digital data transmission system | David K. Worthington, John E. Trombly | 1981-11-24 |