ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,603, issued on Dec. 30, was assigned to Seiko Epson Corp. (Tokyo).
"Photo-curable ink jet ink set and ink jet recording method using the same" was invented by Keitaro Nakano (Matsumoto, Japan) and Jun Ito (Suwa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A photo-curable ink jet ink set includes an undercoating photo-curable ink jet ink containing a (meth)acrylic acid ester having a vinyl ether group expressed by general formula (I), and an overcoating photo-curable ink jet ink. The undercoating photo-curable ink jet ink has a higher surface tension than the overcoating photo-curable ink jet ink."
The patent was filed on Nov. 3, 2023, unde...