Patents by Inventor Ryuichi Tamura

Ryuichi Tamura 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).

  • Blackening treatment solution for black Cr—Co alloy plating film
    Patent number: 9920416
    Abstract: The present invention provides a blackening treatment method for a black Cr—Co alloy plating film, the method comprising bringing a black Cr—Co alloy plating film having a Cr content of 1 to 15 wt. % into contact with a blackening treatment solution comprising an aqueous solution with a pH value of ?1 to 5. According to the present invention, the blackish color of a less blackish plating film formed from a plating bath containing trivalent chromium is enhanced to further improve decorativeness. Furthermore, the corrosion resistance of the film can be more improved by performing electrolytic chromate treatment after blackening treatment.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: March 20, 2018
    Assignee: OKUNO CHEMICAL INDUSTRIES CO., LTD.
    Inventors: Junichi Katayama, Shingo Nagamine, Ryuichi Tamura
  • BLACKENING TREATMENT SOLUTION FOR BLACK Cr-Co ALLOY PLATING FILM
    Publication number: 20150090368
    Abstract: The present invention provides a blackening treatment method for a black Cr—Co alloy plating film, the method comprising bringing a black Cr—Co alloy plating film having a Cr content of 1 to 15 wt. % into contact with a blackening treatment solution comprising an aqueous solution with a pH value of ?1 to 5. According to the present invention, the blackish color of a less blackish plating film formed from a plating bath containing trivalent chromium is enhanced to further improve decorativeness. Furthermore, the corrosion resistance of the film can be more improved by performing electrolytic chromate treatment after blackening treatment.
    Type: Application
    Filed: April 18, 2013
    Publication date: April 2, 2015
    Applicant: OKUNO CHEMICAL INDUSTRIES CO., LTD.
    Inventors: Junichi Katayama, Shingo Nagamine, Ryuichi Tamura