ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,774, issued on April 7, was assigned to RICOH COMPANY LTD. (Tokyo).

"Heating device, image forming apparatus, and liquid discharge apparatus having heating roller with multiple fixed heating sources" was invented by Takuto Kido (Kanagawa, Japan), Toshiya Satoh (Kanagawa, Japan), Yuichi Tanioku (Kanagawa, Japan), Akihiro Shima (Kanagawa, Japan), Teiichiro Ishikawa (Tokyo) and Yusuke Morikawa (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A heating device, an image forming apparatus, and a liquid discharge apparatus. The heating device includes a heating roller having heat sources inside to heat a sheet. The heat sources include three...