Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5864986 | Checking device for roller supported doors | — | 1999-02-02 |
| 5857290 | Checking device for roller supported doors | — | 1999-01-12 |
| 4414703 | Door closer and holder | Richard L. Zunkel | 1983-11-15 |