Patents by Inventor Shoijiro Kuwahara

Shoijiro Kuwahara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • POLYESTER FILM, PROCESS FOR PRODUCING THE SAME AND USE THEREOF
    Publication number: 20090016209
    Abstract: The present invention relates to a polyester film produced by melt-extruding a polyester composed of a dicarboxylic acid unit and a diol unit, wherein 1 to 80 mol % of the diol unit is a unit containing a cyclic acetal skeleton, and the polyester film has an in-plane retardation of 20 nm or less at a wavelength of 550 nm. The polyester film is an optically isotropic polyester film which is easily produced by an extrusion-molding method and has an economical advantage. The polyester film is useful for production of optical members or optical products such as phase difference films, protective films for polarizing plates, light diffusion films, lens sheets, anti-reflection films and optical information recording media.
    Type: Application
    Filed: January 31, 2006
    Publication date: January 15, 2009
    Inventors: Tsuyoshi Ikeda, Koshi Koide, Nobuyuki Koike, Tadashi Kawabata, Takeshi Hirokane, Shoijiro Kuwahara