Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4771090 | Coating compositions for a polymer-modified roofing and waterproofing sheet | Helmut Kehr | 1988-09-13 |
| 4707413 | Coating compositions for a polymer-modified roofing and waterproofing sheet | Helmut Kehr | 1987-11-17 |