Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5222518 | Air flow control valve | Joel T. Fisher, Richard Lewis | 1993-06-29 |
| 5193908 | Agitator suction tube combination | Irving F. Snyder | 1993-03-16 |
| 4213511 | Constant flow hydraulic system | Raymond D. Rubenstein | 1980-07-22 |
| 4181611 | Filter thermal bypass valve | Raymond D. Rubenstein, Russell E. Janke | 1980-01-01 |