Patents by Inventor Masashi Inagaki

Masashi Inagaki 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).

  • Laminated polyester film for magnetic tape having specific surface properties
    Patent number: 5366783
    Abstract: A polyester film prepared through a lamination of at least two layers by coextrusion, wherein one of exposed surfaces (surface A) has a center line average roughness of from 0.002 to 0.015 .mu.m, a polyester layer forming the other of the exposed surfaces (surface B) has a lower melting point than a polyester forming the surface A, and the surface B has a degree of planar orientation of not larger than 0.100, which can be used as a base film for magnetic recording tape having no back coating.
    Type: Grant
    Filed: March 5, 1992
    Date of Patent: November 22, 1994
    Assignee: Diafoil Hoechst Company, Limited
    Inventors: Shigeo Utsumi, Masashi Inagaki, Yuko Watanuki
  • Polyester multilayered film for high-density magnetic disc
    Patent number: 5318823
    Abstract: A multilayered polyester film for high-density magnetic discs, comprising a layer of polyester (A) and a layer of polyester (B) having a thickness of not more than 3 .mu.m, being laminated on at least one side of the layer of polyester (A) and having specific surface characteristics.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: June 7, 1994
    Assignee: Diafoil Hoechst Company, Limited
    Inventors: Shigeo Utsumi, Masashi Inagaki, Yuko Watanuki
  • Magnetic recording medium comprising a polyester film substrate, a magnetic coating and a specified back coat layer
    Patent number: 5188891
    Abstract: Disclosed herein is a magnetic recording medium comprising a polyester film layer, a coating type magnetic layer provided on one side of said polyester film layer, and a back-coat layer provided on the other side of said polyester film layer.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: February 23, 1993
    Assignee: Diafoil Company, Limited
    Inventors: Naohiro Takeda, Yuzo Otani, Nariaki Okajima, Yoshihiko Ito, Shin-ichi Kinoshita, Masashi Inagaki, Takashi Harada
  • 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 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