Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6521133 | Process for thermal sludge disinfection | — | 2003-02-18 |
| 6467494 | Arrangement in a vacuum sewer system for preventing water entering a pneumatic controller through a breather line | Claus Kolb, REINHOLD WILLY BETZ | 2002-10-22 |
| 5673723 | Vacuum sewerage system | — | 1997-10-07 |
| 4369111 | Activated sludge system | — | 1983-01-18 |