Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9776108 | Stationary cloth media filtration | Peter G. Baumann, Lloyd W. Johnson, David Smith | 2017-10-03 |
| 8329045 | Stationary cloth media filtration | Peter G. Baumann, Lloyd W. Johnson, David Smith | 2012-12-11 |
| 7993532 | Method of filtration using cloth media and self-aligning backwash assembly | Peter G. Baumann, Lloyd W. Johnson, David Smith | 2011-08-09 |
| 7892421 | Stationary cloth media filtration and self-aligning backwash assembly | Peter G. Baumann, Lloyd W. Johnson, David Smith | 2011-02-22 |
| 6634372 | High efficiency cleaning of rotating filter media | — | 2003-10-21 |
| 6447617 | High efficiency cleaning of rotating filter media | — | 2002-09-10 |
| 6306310 | Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes | Richard Hsieh, John L. Geibel | 2001-10-23 |
| 6294098 | High efficiency backwash shoe | — | 2001-09-25 |
| 5639384 | Apparatus and method for improving gas backwash in lateral underdrains | Marvin A. Brown, Richard Hsieh | 1997-06-17 |
| 5489388 | Apparatus and method for improving gas backwash in lateral underdrains | Marvin A. Brown, Richard Hsieh | 1996-02-06 |
| 5328608 | Mutli-lateral filter underdrain block | Marvin A. Brown | 1994-07-12 |