US Patent Issued to TOSOH on Sept. 15 for "Optical film and polarizing plate" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,565, issued on Sept. 15, was assigned to TOSOH Corp. (Shunan, Japan).

"Optical film and polarizing plate" was invented by Takuya Komine (Yokkaichi, Japan), Asuka Yoshimura (Yokkaichi, Japan) and Takahiro Kitagawa (Yokkaichi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "There has been a demand for an optical film having excellent glass-range photoelastic coefficient and a polarizing plate which uses this optical film. The present invention provides an optical film which is characterized by containing an ester-based resin that contains 50% by mole or more of a fumaric acid ester residue unit represented by formula (1) and having a negative bi...