Patents by Inventor Takashi Kagiyama

Takashi Kagiyama 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 compositions and process of preparing polyester films from them
    Patent number: 4727108
    Abstract: Disclosed herein is a polyester composition comprising 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, are mainly composed of calcium carbonate and contain 0.001-5% by weight of at least one compound selected from the group consisting of magnesium compounds, strontium compounds and barium compounds.Also disclosed herein is a process for preparing a polyester film by the electrostatic cooling method, which process is characterized by using the polyester composition of the present invention.
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: February 23, 1988
    Assignee: Diafoil Company, Limited
    Inventors: Takashi Kagiyama, Kazuo Endo, Chikakazu Kawaguchi, Yosio Meguro, Kazuhiro Kunugihara
  • Polyester films suitable for use in magnetic recording media
    Patent number: 4708902
    Abstract: A polyester film suitable for use as a substrate for magnetic recording media, characterized in that said polyester film is a biaxially oriented polyester film having an average refractive index n and a planar orientation .DELTA.P, which respectively satisfy the following equations [I] and [II]:n.gtoreq.1.600 [I].DELTA.P.ltoreq.(1.43.multidot.n)- 2.128 [II]and the surface roughness of the film is 0.015 .mu.m or lower.
    Type: Grant
    Filed: February 10, 1987
    Date of Patent: November 24, 1987
    Assignee: Diafoil Company, Limited
    Inventors: Shigeo Utsumi, Tateo Kanesaki, Takashi Kagiyama, Satoshi Otonari, Koichiro Ikushima, Norio Okumura