ALEXANDRIA, Va., July 23 -- United States Patent no. 12,365,177, issued on July 22, was assigned to Canon K.K. (Tokyo).

"Liquid ejection head inspection method, liquid ejection head inspection apparatus, and ejection element substrate" was invented by Satoru Takahashi (Kanagawa, Japan) and Junichiro Iri (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a technique which can inspect liquid ejection energy without changing electric wiring on an ejection element substrate of a liquid ejection head or ejecting liquid from the liquid ejection head. A liquid ejection head as an ejection-energy inspection target includes an ejection element substrate having a substrate, a heat generation p...