Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8499405 | Apparatus for cleaning a waste water treatment tank | Jerold W. Ristau | 2013-08-06 |
| 4978447 | Self-propelled apparatus for cleaning a water treatment tank | — | 1990-12-18 |
| 4830748 | Apparatus for cleaning algae and debris from a water treatment tank | — | 1989-05-16 |