Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6122868 | Accordion shutter system | — | 2000-09-26 |
| 6021839 | Accordion shutter system with improved header and sill configuration | Frank Cornelius, John William Knezevich | 2000-02-08 |
| 5755270 | Accordion shutter system | John William Knezevich, Frank Cornelius | 1998-05-26 |