ALEXANDRIA, Va., March 31 -- United States Patent no. 12,589,598, issued on March 31, was assigned to Seiko Epson Corp. (Tokyo).
"Printing device and printing method" was invented by Yoshiaki Yamamoto (Shiojiri, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A printing device includes a control unit, and the print head including a first nozzle row, a second nozzle row, a third nozzle row, and a fourth nozzle row arrayed along a second direction. A test pattern is printed by a main scan and a sub-scan, and the control unit prints the test pattern so as to include a first line group, a second line group, a third line group, and a fourth line group, and prints the test pattern so that the first line group...