Patents by Inventor Tohru Shimozawa

Tohru Shimozawa 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).

  • Magnetic recording medium
    Patent number: 4741954
    Abstract: A magnetic recording medium comprising a non-magnetic substrate, a magnetic recording layer formed on one side of the substrate and a back coating layer formed on the other side of the substrate, wherein the back coating layer contains an inorganic pigment having a Mohs hardness of at least 5 and carbon black, and the inorganic pigment is in an amount of at most 1/9 by weight relative to the carbon black.
    Type: Grant
    Filed: June 19, 1985
    Date of Patent: May 3, 1988
    Assignee: TDX Corporation
    Inventors: Toshiaki Ide, Tohru Shimozawa, Masaharu Nishimatsu
  • Magnetic recording medium
    Patent number: 4735844
    Abstract: A magnetic recording medium comprising a non-magnetic substrate, a magnetic recording layer formed on one side of the substrate and a back coating layer formed on the other side of the substrate, characterized in that the back coating layer is a radiation-cured coating layer containing a fine particulate pigment having an average particle size of the primary particles of at most 50 m.mu.m and a specific surface area of at least 35 m.sup.2 /g as measured by BET method.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: April 5, 1988
    Assignee: TDK Corporation
    Inventors: Toshiaki Ide, Tohru Shimozawa, Masaharu Nishimatsu
  • Magnetic recording medium
    Patent number: 4699819
    Abstract: A magnetic recording medium comprising a non-magnetic substrate, a magnetic recording layer formed on one side of the substrate and a back coating layer formed on the other side of the substrate, wherein said back coating layer contains graphitized carbon black having an average particle size of from 10 to 50 m.mu.m as measured by an electron microscope.
    Type: Grant
    Filed: July 22, 1985
    Date of Patent: October 13, 1987
    Assignee: TDK Corporation
    Inventors: Toshiaki Ide, Tohru Shimozawa, Masaharu Nishimatsu
  • Magnetic recording medium
    Patent number: 4629646
    Abstract: A magnetic recording medium comprising a non-magnetic substrate, a magnetic recording layer formed on one side of the substrate and a back coating layer formed on the other side of the substrate, characterized in that the back coating layer contains carbon black having an ash content of at most 0.05%, a specific surface area of from 20 to 350 m.sup.2 /g, an oil absorption of at most 200 ml/100 g and an average particle size of from 13 to 60 m.mu.m.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: December 16, 1986
    Assignee: TDK Corporation
    Inventors: Toshiaki Ide, Tohru Shimozawa, Masaharu Nishimatsu