Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5013591 | Building sheeting and method of its manufacture | Bert Haushofer, Wilfried Schumacher, Petru Sabau | 1991-05-07 |
| 4897443 | Polysulfide sheeting | Raymond Robinson, Timothy C. P. Lee, Peter Endruscheit, Lothar Hockenberger, Franz Bergmann +1 more | 1990-01-30 |
| 4780362 | Bituminous roofing strip | Karl Ruehl | 1988-10-25 |
| 4774115 | Bituminous strip for bridge-sealing | Karl Ruehl | 1988-09-27 |