Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4374730 | Process and apparatus for the biological purification of sewage | Alexandru Braha, Hans Daucher, Klaus Hess, Peter Kroetzsch, Roland Roedl +2 more | 1983-02-22 |
HM
Helmut Merkel
Overall (All Time): #4,048,992 of 4,157,543Top 100%
1
Patents All Time