Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7543800 | Single stack manual marine winch | David B. Grapes, Eric Konvolinka, Erik Arlet | 2009-06-09 |
| 7478795 | Marine winch with winch-line engaging roller | David B. Grapes | 2009-01-20 |
| 6572083 | Winch with safe load release system | Richard A. Topping, Jr., David B. Grapes | 2003-06-03 |