US Patent Issued to Nippon Kayaku on May 26 for "Optical functional film for head-up display, optical laminate, functional glass, and head-up display system" (Japanese Inventors)

ALEXANDRIA, Va., May 26 -- United States Patent no. 12,638,678, issued on May 26, was assigned to Nippon Kayaku K.K. (Tokyo).

"Optical functional film for head-up display, optical laminate, functional glass, and head-up display system" was invented by Mitsunori Nakamura (Tokyo), Chihiro Takahashi (Tokyo), Tomoyuki Hayasaki (Joetsu, Japan), Yoshihiko Taira (Tokyo) and Yoshiyuki Yahagi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical functional film for a head-up display according to the present disclosure includes (A) two or more phase difference layers and (B) an adhesive layer. The adhesive layer is adjacent to at least one phase difference layer, and an absolute value of difference between ...