ALEXANDRIA, Va., June 4 -- United States Patent no. 12,319,798, issued on June 3, was assigned to KURARAY Co. LTD. (Okayama, Japan).
"Water-soluble film and packaging" was invented by Minoru Okamoto (Okayama, Japan), Sayaka Shimizu (Okayama, Germany) and Osamu Kazeto (Okayama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a water-soluble film containing polyvinyl alcohol resin, wherein the ratio of fluorine element to the total amount of elements (F1S) found at the time of analyzing a first surface of the water-soluble film through X-ray Photoelectron Spectroscopy is 1 mol % or greater and 25 mol % or less; and ratio of the fluorine element to the total amount of elements (F1B) found...