Patents by Inventor Kengi Hashimoto

Kengi Hashimoto 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 for coloring a stainless steel
    Patent number: 4026737
    Abstract: A method for coloring a stainless steel using a potential-time curve which comprises seeking for an individual coloring potential difference to be colored by compensating a standard coloring potential difference by difference between a standard inflexion point potential and an individual inflexion point potential, and stopping the coloring when the individual coloring potential changes in an amount corresponding to the individual coloring potential difference from the individual inflexion point potential.
    Type: Grant
    Filed: October 17, 1975
    Date of Patent: May 31, 1977
    Assignee: Nippon Steel Corporation
    Inventors: Tomoo Takahari, Shiyuichi Kondo, Nobumasa Sone, Kengi Hashimoto, Tadashi Ishiguro