ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,492,326, issued on Dec. 9, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).
"Thermally expandable and thermosetting adhesive sheet" was invented by Tomoaki Uchiya (Tokyo) and Guanqiao Li (Sagamihara, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An adhesive sheet is a thermally expandable and thermosetting adhesive sheet including a substrate and a first layer provided on at least one surface of the substrate. The first layer contains an adhesive portion having an adhesive composition and thermally expandable first particles contained within the adhesive composition, and second particles provided in the adhesive portion and having d...