Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4358823 | Double redundant processor | John C. McDonald | 1982-11-09 |
| 4288870 | Integrated telephone transmission and switching system | John C. McDonald, Bradley A. Helliwell, Alexander C. Ling, Craig P. Schaffter | 1981-09-08 |
| 4232386 | Subscriber switch controller for controlling connections between a plurality of telephone subscriber lines and a pair of multitime-slot digital data buses | John C. McDonald, Alexander C. Ling | 1980-11-04 |
| 4195206 | Path test apparatus and method | — | 1980-03-25 |