ALEXANDRIA, Va., July 23 -- United States Patent no. RE50,500, issued on July 22, was assigned to Cascade Corp. (Fairview, Ore.).
"Equalized hydraulic clamp force control" was invented by David W. Petronek (Boring, Ore.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Hydraulic valve circuitry adapted for hydraulic connection to a lift truck having a mast and at least one lift cylinder for alternately raising and lowering the mast. The hydraulic assembly is also adapted for hydraulic connection to an attachment to the lift truck, the attachment having opposed clamps actuated by respective clamp cylinders. The hydraulic assembly preferably comprises a valve circuit capable of causing the at least one lift cylin...