Patents by Inventor Junsuki Hokka

Junsuki Hokka 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).

  • Surface treatment method for aluminum heat exchangers
    Patent number: 9739544
    Abstract: A surface treatment method for aluminum heat exchangers including (a) a step wherein a chemical conversion coating film is formed on the surface of an aluminum heat exchanger by subjecting the aluminum heat exchanger to chemical conversion using a chemical conversion agent; (b) a step wherein the aluminum heat exchanger, the surface of which has been provided with a chemical conversion coating film in step (a), is brought into contact with a hydrophilizing agent that contains a hydrophilic resin; and (c) a step wherein a hydrophilized coating film is formed on the surface of the aluminum heat exchanger by baking the aluminum heat exchanger, which has been subjected to a contact treatment in step (b). The chemical conversion agent used in step (a) contains zirconium and/or titanium in an amount of 5-5,000 ppm by mass in total, vanadium in an amount of 10-1,000 ppm by mass and a metal stabilizer in an amount of 5-5,000 ppm by mass. In addition, the chemical conversion agent used in step (a) has a pH of 2-6.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: August 22, 2017
    Assignees: Nippon Paint Surf Chemicals Co., Ltd., Denso Corporation
    Inventors: Norizumi Matsui, Akihiro Mizuno, Yuko Wada, Junsuki Hokka, Kenji Nakamura, Takayuki Hirose, Kengo Kobayashi