ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,160, issued on Feb. 17, was assigned to RISO Technologies Corp. (Tokyo).
"Liquid ejection head and printing device" was invented by Yasuhito Kiji (Mishima Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid ejection head includes a nozzle plate including a nozzle that ejects a liquid, a pressure chamber that communicates with the nozzle, an actuator configured to vary a volume of the pressure chamber in response to a driving signal, and a drive circuit configured to generate the driving signal. The driving signal includes an ejection waveform for ejecting the liquid and causing: an expansion potential difference for expanding the...