Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5636678 | Counterbalancing mechanism for an overhead door | Kenneth E. Carper | 1997-06-10 |
| 5632063 | Counterbalancing mechanism for an overhead door | Kenneth E. Carper, Tony Y. Lin, George S. Carper, Thomas E. Agin | 1997-05-27 |