Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5155481 | Two and three wire utility data communications system | David Hamilton, Warren Wynn | 1992-10-13 |
| 4674113 | Frequency responsive apparatus for reading a meter over a telephone line | Charles Cottle | 1987-06-16 |