Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876548 | Phased array antenna with couplers in spatial filter arrangement | — | 1989-10-24 |
| 4823127 | Automatic, real-time fault monitor verifying network in a microwave landing system | Darrell D. Roelofs, Kenneth R. Doris | 1989-04-18 |