Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4456789 | Audio teleconferencing | Ian S. Groves, David R. Guard, Christopher E. Rowlands, Edwin J. Powter, David William James Holmes +1 more | 1984-06-26 |
| 4237339 | Audio teleconferencing | Robin Cross, David R. Guard, Ian S. Groves, Edward G. T. Johnson, Alan E. Stevens | 1980-12-02 |