Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888591 | Signal discrimination system | Jeremy A. Landt, David A. Eckhardt | 1989-12-19 |
| 4864158 | Rapid signal validity checking apparatus | Donald F. Speirs, Peter L. Hendrick | 1989-09-05 |