Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4295911 | Protective layer for surface seals in building construction, underground construction, and civil engineering construction | Karl Haage | 1981-10-20 |
| 4239795 | Protective layer for surface seals in building construction, underground construction, and civil engineering construction | Karl Haage | 1980-12-16 |