Patents by Inventor Ryouji IWANAGA

Ryouji IWANAGA 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).

  • TRIVALENT CHROMIUM CHEMICAL CONVERSION TREATMENT LIQUID FOR ZINC OR ZINC ALLOY BASE AND CHEMICAL CONVERSION TREATMENT METHOD USING THE SAME
    Publication number: 20220396884
    Abstract: An object is to provide a trivalent chromium chemical conversion treatment liquid for a zinc or zinc alloy base capable of forming an environmentally-friendly chemical conversion coating with high corrosion resistance. The present invention provides a hexavalent chromium-free trivalent chromium chemical conversion treatment liquid for zinc or zinc alloy, the liquid comprising trivalent chromium ions, zirconium ions, nitrate ions, and chain colloidal silica, in which the pH of the treatment liquid is 2.5 to 5.0.
    Type: Application
    Filed: August 16, 2022
    Publication date: December 15, 2022
    Applicant: DIPSOL CHEMICALS CO., LTD.
    Inventors: Ryouji IWANAGA, Manabu INOUE, Tomitaka YAMAMOTO, Takahiro FUJINO
  • TRIVALENT CHROMIUM CHEMICAL CONVERSION TREATMENT LIQUID FOR ZINC OR ZINC ALLOY BASE AND CHEMICAL CONVERSION TREATMENT METHOD USING THE SAME
    Publication number: 20190078214
    Abstract: An object is to provide a trivalent chromium chemical conversion treatment liquid for a zinc or zinc alloy base capable of forming an environmentally-friendly chemical conversion coating with high corrosion resistance. The present invention provides a hexavalent chromium-free trivalent chromium chemical conversion treatment liquid for zinc or zinc alloy, the liquid comprising trivalent chromium ions, zirconium ions, nitrate ions, and chain colloidal silica, in which the pH of the treatment liquid is 2.5 to 5.0.
    Type: Application
    Filed: September 10, 2018
    Publication date: March 14, 2019
    Inventors: Ryouji IWANAGA, Manabu INOUE, Tomitaka YAMAMOTO, Takahiro FUJINO