Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5135651 | Sludge dewatering system | Michael J. Gribbin | 1992-08-04 |
| 5129147 | Sluice gate or penstock door | Robert W. Harper | 1992-07-14 |
| 5129195 | Sluice gate or penstock door | Robert W. Harper | 1992-07-14 |
| 5117871 | Flap valve | Frederick B. Gardner | 1992-06-02 |
| 5103864 | Liquid distribution systems | — | 1992-04-14 |
| 5059322 | Apparatus for dewatering sludge | — | 1991-10-22 |
| 4404099 | Sludge thickening | — | 1983-09-13 |
| 4354935 | Apparatus for thickening sludge | Howard J. Worrall | 1982-10-19 |