Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4764498 | Silica-containing shaped articles and a process for their preparation | Adolf Wissner, Udo Birkenstock | 1988-08-16 |
| 4224248 | Process for the depyrophorization of pyrophoric metal catalysts and uses thereof | Udo Birkenstock | 1980-09-23 |