Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8398004 | Hydraulic drive system for sand and salt spreaders | — | 2013-03-19 |
| 6926033 | Proportional pressure control valve | Zilek Liberfarb | 2005-08-09 |
| 6571828 | Proportional pressure control valve | Zilek Liberfarb | 2003-06-03 |
| 6481463 | Control valve with mechanical feedback and method for controlling fluid flow | — | 2002-11-19 |
| 6422533 | High force solenoid valve and method of improved solenoid valve performance | — | 2002-07-23 |
| 6405746 | Proportional pressure control valve | Zilek Liberfarb | 2002-06-18 |
| 6286535 | Proportional pressure control valve | Zilek Liberfarb | 2001-09-11 |
| 5836335 | Proportional pressure control valve | Zilek Liberfarb | 1998-11-17 |
| 5598794 | High accuracy automatically controlled variable linear seed spacing planting apparatus | Richard Rosenbrock | 1997-02-04 |
| 5461903 | Apparatus and method for detecting leak in hydraulic system | — | 1995-10-31 |
| 4873817 | Electrically controlled pressure relief valve system and method | — | 1989-10-17 |