Patents by Inventor Akiko Yazaki

Akiko Yazaki 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).

  • Test method for phosphate coatings
    Patent number: 4533639
    Abstract: A method for determining the coating weight and composition of a zinc phosphate coating on a ferrous metal surface comprises stripping the coating from a known area using an aqueous solution of sodium hydroxide and triethanolamine, thereafter measuring the iron and phosphate contents by colorimetric analysis of the stripping solution and then determining the coating weight and composition based on such measurements.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: August 6, 1985
    Assignee: Parker Chemical Company
    Inventors: Ryuji Kojima, Akiko Yazaki