Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6018841 | Finishing trowel including handle | Curtis D. Kelsay, Duane W. Woltjen | 2000-02-01 |
| 5713096 | Finishing trowel handle | Curtis D. Kelsay, Duane W. Woltjen | 1998-02-03 |
| 5522111 | Finishing trowel handle | Curtis D. Kelsay, Duane W. Woltjen | 1996-06-04 |