Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864686 | Tamper resistant track assembly | Thomas Ford | 1989-09-12 |
| 4835905 | Door position indicator for a door closer | William L. Downey | 1989-06-06 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864686 | Tamper resistant track assembly | Thomas Ford | 1989-09-12 |
| 4835905 | Door position indicator for a door closer | William L. Downey | 1989-06-06 |