Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4456789 | Audio teleconferencing | David R. Guard, John G. Bunting, Christopher E. Rowlands, Edwin J. Powter, David William James Holmes +1 more | 1984-06-26 |
| 4268716 | Audio teleconferencing | David R. Guard, Steven A. Whalley | 1981-05-19 |
| 4237339 | Audio teleconferencing | John G. Bunting, Robin Cross, David R. Guard, Edward G. T. Johnson, Alan E. Stevens | 1980-12-02 |