Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4747247 | Roof system | Wayne E. Petersen, Gordon P. Petrash, David L. Roodvoets | 1988-05-31 |
| 4712349 | Protected membrane roof system for high traffic roof areas | Wayne E. Petersen | 1987-12-15 |
| 4658554 | Protected membrane roof system for high traffic roof areas | Wayne E. Petersen | 1987-04-21 |