ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,870, issued on Dec. 30, was assigned to TOTO Ltd. (Kitakyushu, Japan).
"Flush toilet" was invented by Jing Chen (Fukuoka, Japan), Hiroshi Hashimoto (Fukuoka, Japan), Satoshi Yamazaki (Fukuoka, Japan) and Kenichi Takano (Fukuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A flush toilet includes a bowl part that includes a waste-receiving surface with a bowl shape that receives waste and a rim part that extends upward on an upper edge part of the waste-receiving surface, a first water-spouting port that spouts a washing water toward the rim part to form a first flow of a washing water that swirls on the waste-receiving surface, a second wat...