ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,758, issued on March 25, was assigned to PLA GIKEN Co. LTD. (Osaka, Japan).
"Flexible tube production apparatus" was invented by Yoshiharu Kikuzawa (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A die has an inner die that has a straight portion of circular columnar outer shape and a convergent tapered portion provided closer to an extrusion port side than the straight portion and an outer die that houses the inner die. A first supply passage connecting a first valve and a flow passage, a second supply passage connecting a second valve and the flow passage, and a third supply passage connecting a third valve and the flow passage are p...