US Patent Issued to SEIKO EPSON on May 12 for "Water-based coloring composition, coloring method, pigment dispersion liquid, and metal pigment producing method" (Japanese Inventors)

ALEXANDRIA, Va., May 12 -- United States Patent no. 12,624,242, issued on May 12, was assigned to SEIKO EPSON Corp. (Japan).

"Water-based coloring composition, coloring method, pigment dispersion liquid, and metal pigment producing method" was invented by Mitsunobu Nakatani (Shiojiri, Japan), Kei Hiruma (Chino, Japan) and Kenta Tsukada (Shiojiri, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A water-based coloring composition contains a metal pigment, water, and an organic solvent. The metal pigment is surface-treated with a first surface treatment agent and a second surface treatment agent, the first surface treatment agent contains a phosphonic-acid-based compound denoted by Formula (1) or a phospho...