ALEXANDRIA, Va., June 5 -- United States Patent no. 12,274,653, issued on April 15, was assigned to HAWE HYDRAULIK SE (Aschheim, Germany).
"Hydraulic drive unit for a stretcher and stretcher with a hydraulic drive unit" was invented by Christian Hart (Nittendorf, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydraulic drive unit for a stretcher has a hydraulic circuit with a differential cylinder, a pump, a tank and a valve assembly. The differential cylinder includes a rod working chamber and a piston working chamber. The valve assembly is switchable into at least a first state and a second state, wherein the rod working chamber is connected to the tank in the first state and to the pump in the s...