Patents by Inventor Mitsuio Tojo

Mitsuio Tojo 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).

  • Biaxially oriented laminate films and magnetic recording media
    Patent number: 5912063
    Abstract: A biaxially oriented laminate film comprising a thermoplastic resin layer A and a thermoplastic resin layer B which is laminated on one side of the thermoplastic resin layer A. The surface of the thermoplastic resin layer A has protrusions having an average height of 2 to 85 nm and an average width of 20 to 500 .mu.m, at a density of 4 to 2,500/mm.sup.2. The thermoplastic resin layer B contains inert fine particles, and the surface of the thermoplastic resin layer B is rougher than the surface of the thermoplastic resin layer A. The laminate film can have furher a layer C on the thermoplastic resin layer A. The surface of the thermoplastic resin layer C has protrusions having an average height of 2 to 85 nm and an average width of 20 to 500 .mu.m, at a density of 4 to 2,500/mm.sup.2. These laminate film are useful as a base film for magnetic recording medium.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: June 15, 1999
    Assignee: Teijin Limited
    Inventors: Toshifumi Osawa, Makoto Handa, Mitsuio Tojo, Hideaki Watanabe