Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5839555 | Automatic clutch type chain pulling mechanism for a motor rolling door | — | 1998-11-24 |
| 5706552 | Apparatus for preventing a motor rolling door from falling | — | 1998-01-13 |
| 5579878 | Bi-directional clutch type chain pulling device for rolling doors | — | 1996-12-03 |
| 5355741 | Failsafe limit switch with automatic reset for rolling fire door | — | 1994-10-18 |