Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858223 | Security arrangement for a telecommunications exchange system | Geoffrey Chopping, Richard N. Waters | 1989-08-15 |
| 4535442 | Digital switching network for telecommunications exchange | Thomas S. Maddern, Alexander S. Philip | 1985-08-13 |
| 4530089 | Telecommunications digital switchblock utilizing control switch state maps | Thomas S. Maddern, Alexander S. Philip | 1985-07-16 |