Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4417646 | Counterweight system | — | 1983-11-29 |
| 4374537 | Collapsing closure system and operating mechanism | — | 1983-02-22 |
| 4320793 | Outward thrusting door weatherstrip | — | 1982-03-23 |
| 4303117 | Vertically collapsing closure system | — | 1981-12-01 |
| 4236605 | Variable counterweight system | — | 1980-12-02 |