ALEXANDRIA, Va., June 17 -- United States Patent no. 12,311,519, issued on May 27, was assigned to Milwaukee Electric Tool Corp. (Brookfield, Wis.).
"Hydraulic pump" was invented by James G. Ballard (Waukesha, Wis.), Timothy Radtke (New Berlin, Wis.), Daniel Garces (Waukesha, Wis.) and Ian C. Zimmerman (Milwaukee).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydraulic pump includes a work port configured to supply fluid to a hydraulic tool. A high-flow piston supplies fluid along a first flow path to the work port and plurality of high-pressure pistons supplies fluid along a second flow path to the work port. An unloading valve is positioned along the first flow path and actuates from an open state to a c...