Patents by Inventor Keizou Takahashi

Keizou Takahashi 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).

  • Thermal transfer recording medium
    Patent number: 5178930
    Abstract: A thermal transfer recording medium comprising a support and a heat-fusible ink layer, coated on the support, which comprises a colorant and a binder. The binder comprises a polyurethane having bisphenol units or a polyether having bisphenol units and an hydroxyl group at the terminals. The thermal transfer recording medium provides a transferred image with a high quality regardless of the transferring paper.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: January 12, 1993
    Assignee: Kao Corporation
    Inventors: Kouichi Sakai, Sadashi Ueda, Keizou Takahashi, Hiroshi Shibano
  • Hardened center pin contract area on magnetic disk cartridge
    Patent number: 5053905
    Abstract: A magnetic disk cartridge is of the type in which a magnetic disk is rotatably disposed within a jacket. A hardened layer of an ultraviolet ray hardening resin is formed on an inner surface of the jacket which is contacted with a tip of a center pin of a magnetic disk driving apparatus passing through an opening portion of the magnetic disk. The hardness of the hardened layer is 1.times.10.sup.10 dyn/cm.sup.2 to 1.times.10.sup.5 dyn/cm.sup.2.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: October 1, 1991
    Assignee: Kao Corporation
    Inventors: Syuji Kiji, Keizou Takahashi