ALEXANDRIA, Va., July 16 -- United States Patent no. 12,668,012, issued on June 30, was assigned to SUMITOMO HEAVY INDUSTRIES MODERN LTD. (Yokohama, Japan).
"Extruder" was invented by Shoichi Ishida (Yokohama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An extruder includes a cylinder and a screw that is accommodated in the cylinder, in which an inner peripheral surface of the cylinder includes first and second groove formed regions each of which has a groove formed therein, in the first groove formed region, a height of a mountain portion forming the groove is constant, and a presence range of the second groove formed region in an axial direction at least partially overlaps a presence range of a ma...