Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6312611 | Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes | Eugene O. Bergman, John L. Geibel | 2001-11-06 |
| 6306310 | Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes | Eugen O. Bergmann, John L. Geibel | 2001-10-23 |
| 6164349 | Machine for cutting plates from timber | — | 2000-12-26 |
| 5639384 | Apparatus and method for improving gas backwash in lateral underdrains | Marvin A. Brown, Eugen O. Bergmann | 1997-06-17 |
| 5489388 | Apparatus and method for improving gas backwash in lateral underdrains | Marvin A. Brown, Eugen O. Bergmann | 1996-02-06 |