Patents by Inventor Hironobu Kawaskai

Hironobu Kawaskai 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).

  • Rust preventing treatment of metal-plated steel materials
    Patent number: 4247344
    Abstract: A rust preventing treatment for a metal-plated steel product which comprises treating the metal-plated steel product with an aqueous solution containing 0.01% to 10% by weight of tannic acid on the basis of the aqueous solution and 0.001% to 10% by weight of a water-soluble or water-dispersible polymer which is stable when mixed with the tannic acid to form a corrosion resistant film on the surface of the metal-plated steel product.
    Type: Grant
    Filed: June 5, 1979
    Date of Patent: January 27, 1981
    Assignee: Nippon Steel Corporation
    Inventors: Seizo Tsuda, Eiichi Tarumi, Hironobu Kawaskai, Takashi Watanabe