Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4532261 | Filler system for a non-flammable rigid foam and use of the rigid foam as a building material | Erich Ruhl | 1985-07-30 |
| 4521543 | Non-flammable rigid foam and its use as a building material | Erich Ruhl | 1985-06-04 |
| 4463106 | Non-flammable rigid foam and its use as a building material | Erich Ruhl | 1984-07-31 |