Patents by Inventor Akimitsu Fukuda

Akimitsu Fukuda 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: 4784731
    Abstract: A chromate treatment of metal coated steel sheets comprising subjecting the sheets to a cathodic electrolytic treatment to form a chromate film thereon and subjecting the sheet to an anodic electrolytic treatment to form an anodic electrolytic film on the chromate film and to convert the chromate film. The treatment is applicable to various metal coated steel sheets, such as those coated with zinc, zinc alloy, aluminum, aluminum alloy, lead and lead alloy, and is effective to improve the corrosion resistance of the sheets, the quality of paint coating applied on the sheets and the adaptability of the sheets to a cation electro-deposition paint coating.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: November 15, 1988
    Assignee: Nippon Steel Corporation
    Inventors: Seijun Higuchi, Akinori Maruta, Kenichi Asakawa, Akimitsu Fukuda, Haruyoshi Terada, Youji Ono
  • Patent number: 4756805
    Abstract: A method of treating a zinc plated steel surface provides improved corrosion resistance and painting properties. The surface is rendered cathodic in the presence of an aqueous treatment liquor containing 5-70 g/l of hexavalent chromium, 0.01 to 5 g/l of trivalent chromium, 5-100 g/l of silica and/or silicate and 0.05-10 g/l of nitrate in which the ratio of Cr.sup.3+ /Cr.sup.6+ is within the range 1/50-1/3.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: July 12, 1988
    Assignee: Nihon Parkerizing Co., Ltd.
    Inventors: Haruyoshi Terada, Akimitsu Fukuda, Yohji Oho
  • Patent number: 4637840
    Abstract: A coating process for aluminum-zinc alloy plated sheet steel provides an article having a surface of improved formability and enhanced corrosion resistance; appearance and paintability. The coating is applied in aqueous form at a prescribed pH value and dried. The aqueous coating contains a water dispersible or water soluble resin and hexavalent chromium in desired proportions.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: January 20, 1987
    Assignee: Nihon Parkerizing Co., Ltd.
    Inventors: Haruki Fujii, Shoji Ikada, Akimitsu Fukuda, Yasuo Okumura
  • Patent number: 3957543
    Abstract: Disclosed is a composition and method for its use to improve the corrosion resistance of conversion-coated metal surfaces. The composition contains a myo-inositol phosphate ester or soluble salt thereof and is applied as a rinse of the conversion coating.
    Type: Grant
    Filed: February 1, 1974
    Date of Patent: May 18, 1976
    Assignee: Oxy Metal Industries Corporation
    Inventors: Hiroshi Shinomiya, Kakuro Muro, Akimitsu Fukuda, Yoshio Nagae, Yoshiji Shirogane