Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885740 | Digital signal switch | Brian J. Parson, Roger M. Shepherd, Graham W. Stewart | 1989-12-05 |
| 4819151 | Microcomputer | — | 1989-04-04 |
| 4811277 | Communication interface | Henry M. Chesney | 1989-03-07 |