ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,447,740, issued on Oct. 21, was assigned to Canon K.K. (Tokyo).
"Ejection apparatus and ejection speed calculation method" was invented by Yusuke Kiyokawa (Tokyo) and Masashi Negishi (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "In a state where a distance from an ejection port surface of an ejection head to a predetermined position corresponds to a first distance, a period detection unit detects a first period from when ejection of a droplet from an ejection port is started until when a droplet detection unit detects the droplet, and in a state where the distance from the ejection port surface of the ejection head to the predetermined...