ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,205, issued on May 27, was assigned to Fujikin Inc. (Osaka, Japan).
"Closing plug and fluid control device" was invented by Ichiro Tokuda (Osaka, Japan), Tsuyoshi Tanikawa (Osaka, Japan) and Yukio Minami (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a closing plug capable of easily closing an open end of a flow passage without concern of scale. The closing plug includes: a gasket configured to come into contact with an annular projection formed in a step portion inside the open end of the flow passage of a flow passage block; a columnar pressing member formed by cutting out an inner side of a pressing surface so as to pres...