US Patent Issued to Nippon Kayaku on July 14 for "Ink set, inkjet recording method, ink medium set, and printing medium" (Japanese Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,679,988, issued on July 14, was assigned to Nippon Kayaku K.K. (Tokyo).

"Ink set, inkjet recording method, ink medium set, and printing medium" was invented by Michiaki Takeda (Tokyo), Ha Sai (Tokyo), Shogo Toda (Tokyo), Hirotoshi Takahashi (Tokyo) and Yuri Nakagawa (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An ink set which includes a first ink composition that contains a coloring agent, a surfactant in an amount of A1 mass %, a hydrophobic organic solvent in an amount of A2 mass %, and water, the first ink composition being used to form a first image, and a second ink composition that contains a coloring agent, a surfactant in an amount of ...