Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5362395 | Method and apparatus for biologically purifying sewage which is organically loaded with substances difficult to decompose biologically or not decomposable biologically | Friedrich Wagner, Herbert Wienands, Robert Rautenbach, Rainer Mellis | 1994-11-08 |