Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5694664 | Coupling for spiral counterbalance | William P. Newton | 1997-12-09 |
| 5615452 | Lift-off guard guide for tilt shoe | — | 1997-04-01 |
| 5159794 | Jamb liner slot cover | Norman R. Westfall | 1992-11-03 |
| 5119592 | Balance system for laterally biased sash guides | Norman R. Westfall, William P. Newton, John T. Forbis | 1992-06-09 |
| 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 |