Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885871 | Audibly locking shoe system for take-out window | Norman R. Westfall, James A. Martini | 1989-12-12 |
| 4800680 | Cord guide system for sash balance | Norman R. Westfall, Patrick E. Milligan, Brian S. Dense | 1989-01-31 |
| 4799333 | Lock shoe system for take-out window | Norman R. Westfall, James A. Martini | 1989-01-24 |