Patents by Inventor Norio Hamba

Norio Hamba 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).

  • Method of producing a metal gasket
    Patent number: 5032430
    Abstract: A method of producing a metal gasket having at least a cooling water opening comprises steps of coating a surface treatment agent on an outer surface of the metal gasket, covering by a masking jig the outer surface of the metal gasket except a region surrounding the cooling water opening, and removing the surface treatment agent in the region by jetting superhigh pressure water at the region.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: July 16, 1991
    Assignee: Nippon Leakless Industry Co., Ltd.
    Inventors: Tsunehiko Abe, Sadao Watanabe, Norio Hamba
  • Metal gasket
    Patent number: 4968045
    Abstract: A metal gasket for an internal combustion engine has cylinder openings and a cooling water openings and is coated on its outer surface with a surface treatment agent. The surface treatment agent in a region of the metal gasket surrounding the cooling water openings has been removed. A method of producing a metal gasket having at least a cooling water opening comprises steps of coating a surface treatment agent on an outer surface of the metal gasket, covering by a masking jig the outer surface of the metal gasket except a region surrounding the cooling water opening, and removing the surface treatment agent in the region by jetting superhigh pressure water at the region.
    Type: Grant
    Filed: November 22, 1988
    Date of Patent: November 6, 1990
    Assignee: Nippon Leakless Industry Co., Ltd.
    Inventors: Tsunehiko Abe, Sadao Watanabe, Norio Hamba