Patents by Inventor Nobuyasu Shudo

Nobuyasu Shudo 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 films, magnetic recording media and film capacitors produced therefrom
    Patent number: 5106681
    Abstract: Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibility of the particles in the film.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: April 21, 1992
    Assignee: Diafoil Company, Limited
    Inventors: Kazuo Endo, Nobuyasu Shudo, Chikakazu Kawaguchi, Yoshio Meguro, Masahiko Fujimoto, Toshifumi Takisawa, Masashi Inagaki
  • Polyester composition
    Patent number: 5023291
    Abstract: Disclosed herein is a polyester composition which comprises a polyester with a terminal carboxyl group content of 40 to 80 equivalents/10.sup.6 and 0.0 to 5 wt %, based on the total amount of the polyester composition, aluminum oxide particles of 0.005 to 5 .mu.m in average particle diameter and which has a melt resistivity of 6 x 10.sup.6 to 5 x 10.sup.8 .OMEGA..cm.By using the polyester composition, it is possible to successively produce a film having excellent wear resistance and flatness over a long production run.
    Type: Grant
    Filed: July 13, 1989
    Date of Patent: June 11, 1991
    Assignee: Diafoil Company, Limited
    Inventors: Seiji Sakamoto, Nobuyasu Shudo
  • Polyester films, magnetic recording media and film capacitors produced therefrom
    Patent number: 4990400
    Abstract: Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibliity of the particles in the film.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: February 5, 1991
    Assignee: Diafoil Company, Limited
    Inventors: Kazuo Endo, Nobuyasu Shudo, Chikakazu Kawaguchi, Yoshio Meguro, Masahiko Fujimoto, Toshifumi Takisawa, Masashi Inagaki, Kenji Kato, Shigeo Utsumi, Kichinojo Tomitaka, Shigeyuki Watanabe, Kazuyuki Akatsu