ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,820, issued on June 24, was assigned to HEISHIN Ltd. (Hyogo, Japan).
"Uniaxial eccentric screw pump" was invented by Eiji Uetsuji (Shiga, Japan) and Noriaki Sakakihara (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A uniaxial eccentric screw pump includes: a stator having an insertion hole with an inner peripheral surface being internally threaded; and a rotor being externally threaded and placed through the insertion hole. In a cross section, the rotor has a cross-sectional center displaceable in a reciprocating manner in a longitudinal direction of the insertion hole between a pair of turn positions along a center line extending in t...