Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873853 | Escutcheon assembly | — | 1989-10-17 |
| 4843852 | Disposable construction core | Duane B. Nixon, Ralph P. Palmer | 1989-07-04 |
| 4836001 | High security lock | — | 1989-06-06 |
| D301116 | Bar lock assembly | Duane B. Nixon | 1989-05-16 |
| 4813254 | Bar lock apparatus | Duane B. Nixon | 1989-03-21 |