Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4505985 | Membranes based on silicic acid heteropolycondensates and a process for their production | Helmut Schmidt, Horst Scholze | 1985-03-19 |
| 4440745 | Abrasive compositions | Helmut Schmidt | 1984-04-03 |