Patents by Inventor Yoshiji Shirogane

Yoshiji Shirogane 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).

  • Process for activating steel surface prior to phosphating treatment aqueous activating solution therefor
    Patent number: 4517030
    Abstract: This invention discloses a process for activating steel surface prior to phosphating treatment wherein the steel surface is cleaned, the cleaned steel surface is then treated with an aqueous activating solution containing titanium and pyrophosphate ion, and thereafter the steel surface is treated with a phosphating solution, characterized in that magnesium ion is included in said aqueous activating solution in order to suppress formation of an inactive film on said steel surface due to the presence of said pyrophosphate ion, and then said steel surface is treated with the resulting aqueous activating solution.
    Type: Grant
    Filed: August 6, 1984
    Date of Patent: May 14, 1985
    Assignees: Toyota Motor Corp., Nihon Parkerizing Co.
    Inventors: Tsukasa Yamamoto, Asao Mochizuki, Hiroshi Okita, Toshi Miyawaki, Yoshiji Shirogane, Kazuhiko Mori
  • Method for rinsing a conversion coated metal surface
    Patent number: 3957543
    Abstract: Disclosed is a composition and method for its use to improve the corrosion resistance of conversion-coated metal surfaces. The composition contains a myo-inositol phosphate ester or soluble salt thereof and is applied as a rinse of the conversion coating.
    Type: Grant
    Filed: February 1, 1974
    Date of Patent: May 18, 1976
    Assignee: Oxy Metal Industries Corporation
    Inventors: Hiroshi Shinomiya, Kakuro Muro, Akimitsu Fukuda, Yoshio Nagae, Yoshiji Shirogane