Patents by Inventor Hiromi Hieno

Hiromi Hieno 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).

  • Chrome plated parts and chrome plating method
    Patent number: RE40386
    Abstract: Using a chrome plating bath containing organic sulfonic acid, plating is conducted by application of a pulse current to thereby form a crack-free lower chrome layer on a steel substrate. The lower chrome layer has a compressive residual stress of 100 MPa or more and a crystal grain size of from 9 nm to less than 16 nm. Subsequently, by application of a direct current, a cracked upper chrome layer is formed on the lower chrome layer, to thereby obtain a chrome plated part. The lower chrome layer imparts the chrome plated part with heat resistance and corrosion resistance, and the upper chrome layer imparts the chrome plated part with wear resistance and good sliding properties.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: June 17, 2008
    Assignee: Hitachi Ltd.
    Inventors: Yuichi Kobayashi, Junichi Nagasawa, Shoichi Kamiya, Toshiyuki Fukaya, Hiromi Hieno, Kazuo Watanabe