Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7500778 | Polymer mixing apparatus | — | 2009-03-10 |
| 5338779 | Dry polymer activation apparatus and method | — | 1994-08-16 |
| 5316031 | Valve with independent control of discharge through plurality of orifices | Yong-Ha Kim | 1994-05-31 |
| 5284627 | Polymer activation apparatus | Troy C. Litherland, J. Derek Green, Yong Hoon Kim | 1994-02-08 |
| 5284626 | Polymer activation apparatus | Troy C. Litherland, Derek J. Green | 1994-02-08 |
| 5252635 | Polymer activation method using two separate mixing zones | Troy C. Litherland, J. Derek Green | 1993-10-12 |
| 5164429 | Polymer activation apparatus | Troy C. Litherland, J. Derek Green, Yong Hoon Kim | 1992-11-17 |
| 5135968 | Methods and apparatus for treating wastewater | Yong-Ha Kim | 1992-08-04 |
| 5061456 | Polymer activation apparatus | Troy C. Litherland, J. Derek Green | 1991-10-29 |
| 5018870 | Dual-pump mixing and feeding apparatus | Troy C. Litherland, James G. Johnston | 1991-05-28 |
| 5018871 | Polymer dilution and activation apparatus | Troy C. Litherland | 1991-05-28 |
| 4981367 | Portable mixing apparatus | — | 1991-01-01 |
| 4920519 | Dual-pump mixing and feeding apparatus | Troy C. Litherland, James G. Johnston | 1990-04-24 |
| 4778280 | Mixing apparatus | — | 1988-10-18 |
| 4688945 | Mixing apparatus | Troy C. Litherland | 1987-08-25 |
| 4642222 | Polymer feed system | — | 1987-02-10 |
| 4522502 | Mixing and feeding apparatus | — | 1985-06-11 |
| 4203390 | Aquatic exercise facility with island | — | 1980-05-20 |
| 4197815 | Aquatic exercise facility for animals | — | 1980-04-15 |