ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,368, issued on Dec. 2, was assigned to UNITIKA Ltd. (Osaka, Japan).
"Polyester film and method for producing same" was invented by Hiroshi Ashihara (Kyoto, Japan), Takayoshi Okuzu (Tokyo), Ken Akamatsu (Kyoto, Japan), Akiko Kurosawa (Kyoto, Japan), Goro Araki (Kyoto, Japan) and Akito Kajita (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A polyester film includes a polyester (A) composed mainly of polybutylene terephthalate and a polyester (B) composed mainly of polyethylene terephthalate, wherein a mass ratio (A/B) between the polyesters (A) and (B) is 70/30 to 55/45, a dry heat shrinkage rate (B) through heat treatment at 200deg C. for...