Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6231756 | Rotary distributor speed control system for trickling filters | — | 2001-05-15 |
| 5433292 | Stacker | Mark I. Johnson | 1995-07-18 |
| 5149242 | Vertical drive apparatus for storage and retrieval vehicles | — | 1992-09-22 |
| 5149241 | Dual mast apparatus for storage and retrieval vehicles | Mark I. Johnson | 1992-09-22 |
| 4647215 | Ragless propeller draft tube mixer | Jack R. Armitage | 1987-03-03 |
| 4624787 | Lifting mechanism for sedimentation device | Heinz W. Winter | 1986-11-25 |
| 4624783 | Apparatus for granular media filter | Brent C. Black, Bruce D. Bradley | 1986-11-25 |
| 4575256 | Ragless propeller draft tube mixer | Jack R. Armitage | 1986-03-11 |
| 4515694 | Cable lifting mechanism for sedimentation device | Heinz W. Winter | 1985-05-07 |
| 4450077 | Granular media filter | Brent C. Black, Bruce D. Bradley | 1984-05-22 |