Patents by Inventor Keishi Tomii

Keishi Tomii 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).

  • Zinc alloy for use with electrode
    Patent number: 4432937
    Abstract: An alloy comprising more than 0.01% of gallium and more than 0.01% of indium added to zinc which is usable, as conventional zinc dust or zinc can, for the electrode of a dry cell and shows a high hydrogen overvoltage and evolves less hydrogen gas during storage of the cell.
    Type: Grant
    Filed: August 4, 1982
    Date of Patent: February 21, 1984
    Assignee: Toho Aen Kabushiki Kaisha
    Inventors: Kenta Kuwayama, Junzo Nakagawa, Keishi Tomii, Kenji Hagimori
  • Solvent extraction recovery process for indium
    Patent number: 4292284
    Abstract: Indium is recovered effectively from an aqueous leached solution containing indium ions, together with other ions such as ferric ions, zinc ions, etc. if any, by adjusting the pH of the aqueous solution to 0.25-4.5, extracting the indium ions from the aqueous solution with an organic solvent solution formed by diluting an extraction reagent containing a monoalkylphosphoric acid and/or a dialkylphosphoric acid and a trialkylphosphoric acid in 1:2-5 by volume ratio with a phase-stabilizing water-immiscible organic solvent and then back-extracting the indium ions in the organic solvent solution with an aqueous sulfuric acid solution.
    Type: Grant
    Filed: June 27, 1980
    Date of Patent: September 29, 1981
    Assignee: Toho Aen Kabushiki Kaisha
    Inventors: Keishi Tomii, Hideyuki Tsuchida