ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,390, issued on Nov. 18, was assigned to SEKISUI KASEI Co. LTD. (Osaka, Japan).
"Hydrogel sheet" was invented by Ryo Iizuka (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydrogel sheet includes a hydrogel, and a plurality of intermediate substrates placed in the hydrogel. The plurality of intermediate substrates includes first and second intermediate substrates. The first intermediate substrate has a stretch rate of 20% to 90% measured by the following measurement method. An intermediate substrate having a 20-mm width and a 100-mm length is clamped at 70-mm intervals in the length direction. Then, the intermediate substrate is stretc...