Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6159876 | Roofing ply product | — | 2000-12-12 |
| D414279 | Base sheet for roofing assembly | Harold C. Albo, Jr., Brent L. Grazman, William Davis Lee, William J. Woodring | 1999-09-21 |
| 5890336 | Base sheet for roofing assembly | Harold C. Albo, Jr., Brent L. Grazman, William Davis Lee, William J. Woodring | 1999-04-06 |
| 4567079 | High-strength built-up roofing using improved ply sheets | V. Robert Canfield, William J. Woodring | 1986-01-28 |