Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4996801 | Termination bar and splice for rubberized roofing sheets | Delano H. Ristow | 1991-03-05 |
| 4977659 | Tool for seating tubing in a concealed roofing base rail | Delano H. Ristow | 1990-12-18 |