ALEXANDRIA, Va., July 3 -- United States Patent no. 12,343,281, issued on July 1, was assigned to Kao Corp. (Tokyo).
"Heating implement" was invented by Yasuhiro Shidahara (Sumida-ku, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A warming device including a heat generating element that contains a powder of an oxidizable metal, a powder of a carbon material, water, and a powder of a porous material other than the oxidizable metal and the carbon material. The heat generating element is a sheet material, and in the heat generating element, a ratio of the mass content of the water to the mass content of the powder of the oxidizable metal multiplied by one hundred [100x(water/powder of oxidizable metal)] ...