Patents by Inventor Akiko Sueyoshi

Akiko Sueyoshi 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).

  • Phosphating of metallic substrate
    Patent number: 4180417
    Abstract: In a method for phosphating the surface of a metallic substrate by treatment with a phosphating solution containing nitrite ions as the accelerator, an improvement wherein the supply of the nitrite ions to the phosphating solution is carried out by electrolytic reduction of nitrate ions present in the phosphating solution while changing the direction of the current flow at a fixed interval of time, whereby a desired concentration of nitrite ions in the phosphating solution is maintained without accumulation of alkali metal and/or ammonium ions unavailable for the phosphating and also without accumulation of precipitates on the electrode, and a uniform phosphate coating film having satisfactorily good coating properties is formed on said surface.
    Type: Grant
    Filed: October 12, 1978
    Date of Patent: December 25, 1979
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Shoji Oka, Ryoichi Murakami, Akiko Sueyoshi
  • Phosphating of metallic substrate with electrolytic reduction of nitrate ions
    Patent number: 4113519
    Abstract: In a method for phosphating the surface of a metallic substrate by treament with a phosphating solution comprising nitrite ions as the accelerator, an improvement wherein the supply of the nitrite ions to the phosphating solution is carried out by electrolytic reduction of nitrate ions present in the phosphating solution, whereby a desired concentration of nitrite ions in the phosphating solution is maintained without accumulation of alkali metal and/or ammonium ions unavailable for the phosphating and a uniform phosphate coating film having satisfactorily good coating properties is formed on said surface.
    Type: Grant
    Filed: April 27, 1977
    Date of Patent: September 12, 1978
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Shoji Oka, Ryoichi Murakami, Akiko Sueyoshi