Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4321431 | Trunk circuit with single coupling transformer | Patrick R. Beirne, Michael C. J. Cowpland | 1982-03-23 | $7,799,000 |
| 4182936 | Transformerless trunk circuit | Patrick R. Beirne, Michael C. J. Cowpland | 1980-01-08 |