Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872082 | Door operator safety feature requiring constant actuation to close door | — | 1989-10-03 |
| 4847542 | Automatic garage door operator with remote load control | John Clark, James Scott Murray | 1989-07-11 |