Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D434158 | Ladder step extender | Phillip F. Bolf | 2000-11-21 |
| D409765 | Ladder step extender | Phillip F. Bolf | 1999-05-11 |
| D390669 | Ladder step extender | Phillip F. Bolf | 1998-02-10 |
| 4570777 | Treadle control | — | 1986-02-18 |