Patents by Inventor Katsuyoshi Ishii

Katsuyoshi Ishii 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).

  • Determination of sulfurous acid in liquids and an apparatus therefor
    Patent number: 4554255
    Abstract: A method and an apparatus providing a simple and speedy determination of a slight amount of sulfurous acid contained in liquids by means of pH meters, based on the Modified Rankine's method in principle, and wherein the pH of a first sample of liquid is determined before and after adding an amount of hydrogen peroxide thereto, the pH of a second sample of liquid is determined before and after adding an amount of an acid or lower pH buffer solution thereto, and the concentration of sulfurous acid in the liquid is calculated from the measured pH values and an equation derived from the functional relationship:c=f(.DELTA.pH.sub.A, .DELTA.pH.sub.B)wherein c is the concentration of sulfurous acid.
    Type: Grant
    Filed: July 6, 1983
    Date of Patent: November 19, 1985
    Assignee: Sanwa Shoji Co., Ltd.
    Inventors: Katsuyoshi Ishii, Michio Kobori, Seiichi Morimoto