Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5996298 | Modular shutter | John C. Wenzlaff | 1999-12-07 |
| 5826393 | Fastenerless modular shutter with adjustable panel support member | John C. Wenzlaff, Stephen J. Schreiner, Joseph P. Creasey, Alan MacGowan, LeRoy Pohl +2 more | 1998-10-27 |
| 5524407 | Modular shutter and retention assembly | Dave Bures, Alan MacGowan, LeRoy Pohl, Steve Schreiner, John C. Wenzlaff | 1996-06-11 |
| 5265391 | Stabilized modular shutter | Alan MacGowan | 1993-11-30 |
| 5163260 | Multi-panel modular shutter assembly | Alan MacGowan | 1992-11-17 |