ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,528,307, issued on Jan. 20, was assigned to OJI HOLDINGS Corp. (Tokyo).
"Heat-sensitive recording body" was invented by Takashi Takemura (Tokyo), Naonobu Sugiyama (Tokyo) and Daiki Watanabe (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a heat-sensitive recording material comprising an undercoat layer and a heat-sensitive recording layer in this order on a support, the undercoat layer containing hollow particles, a binder, and an inorganic pigment I, the heat-sensitive recording layer containing a leuco dye, a developer, and an inorganic pigment II, and the heat-sensitive recording layer containing an N,N'-diarylurea-based compound r...