ALEXANDRIA, Va., April 21 -- United States Patent no. 12,605,650, issued on April 21, was assigned to Shounan Engineering Inc. (Kagoshima, Japan).
"Method for removing oil in cleaning liquid" was invented by Masaji Sazawa (Kagoshima, Japan) and Naosuke Sazawa (Kagoshima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for removing oil in cleaning liquid, by which fine oil in cleaning liquid can be removed efficiently with a filter element for a general-purpose filter element for separating foreign substance. As a plurality of annular protrusions 22d are formed on an outer circumferential surface 22a of the filter element 22 along substantially whole length of the filter element 22 in axis line ...