ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,831, issued on Feb. 25, was assigned to KSB SE & Co. KGaA (Frankenthal, Germany).
"Pump shaft for a multi-stage pump" was invented by Gerhard Gross (Frankenthal, Germany), Kai Molitor (Frankenthal, Germany) and Sophia Sergi (Frankenthal, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A pump shaft for a multi-stage pump, in particular a centrifugal pump, includes a peripheral groove region for the engagement of a relief device in order to introduce a force acting in the axial direction of the pump shaft. The groove region includes a plurality of grooves which are spaced apart in the axial direction."
The patent was filed on June 22, 2020, un...