ALEXANDRIA, Va., Feb. 12 -- United States Patent no. 12,220,656, issued on Feb. 11, was assigned to ThreeSquared Solutions LLC (Charlotte, N.C.).
"Removable inner frame assembly for clean environments" was invented by James T. Crawford III (Charlotte, N.C.), Edward W. Waters Jr. (Charlotte, N.C.) and Christopher Jacobs (Charlotte, N.C.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A removable inner frame assembly for use with a filter element and a main frame includes an inner frame, a bottom sealant layer, and a top sealant layer. The filter element has a lower edge extending from an outer perimeter of the filter element. The inner frame has a plurality of U-shaped sides. The first end of each side is conn...