Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889875 | Phenolic resin foams of high filler content and their use as insulation | Aloys Aust, Franz Weissenfels | 1989-12-26 |
| 4369259 | Color-stabilized phenolic foams | Franz Weisselfels | 1983-01-18 |