Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5314630 | Systems and methods for clarifying liquids | R. Lee Roberts | 1994-05-24 |
| 5198124 | Upflow filter and method of washing same | R. Lee Roberts | 1993-03-30 |
| 5080808 | Method of washing an upflow filter and filter bed employed in said filter | R. Lee Roberts | 1992-01-14 |