Patents by Inventor Yasuo Okada

Yasuo Okada 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).

  • Patent number: 5370958
    Abstract: An object of the present invention is to provide an electrophotographic toner for high-speed copying machines having a high hot-roll speed and capable of fixing a toner at lower temperatures. The toner according to the present invention comprises a vinyl resin which has a wide molecular-weight distribution (Mn:1,000-20,000, Mw: 50,000-2,000,000), a glass transition temperature (Tg) of 40.degree.-75.degree. C. and a low acid value (AV:1-10); and a glycidyl compound in an amount sufficient to provide 0.05-1.0 equivalent of glycidyl groups per equivalent of COOH groups in the vinyl resin. It assures well-balanced fixing property, offset resistance and blocking resistance. In particular, it exhibits a remarkable effect in improving offset resistance and also in grindability during the production of the toner.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: December 6, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Masaaki Shin, Kenji Uchiyama, Yasuo Okada
  • Patent number: 3939897
    Abstract: A method for producing a heat-insulating casting characterized by placing a flexible ceramic semifinished product having a smooth surface, a modulus of elasticity of 200-5000 Kg/mm.sup.2, a bending strength of 8-200 Kg/cm.sup.2, and a wall-thickness less than 1/4 of the inside diameter, inside a casting mold, and casting molten metal so as to enclose the ceramic semifinished product.
    Type: Grant
    Filed: July 10, 1973
    Date of Patent: February 24, 1976
    Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
    Inventors: Yasuhisa Kaneko, Yasuhiko Komatsu, Yoshihiro Hibino, Yasuo Okada