Patents by Inventor Iwao Kojima

Iwao Kojima 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).

  • Method of removing mercury vapor from gases contaminated therewith
    Patent number: 4009241
    Abstract: A method of removing mercury vapor from a gas contaminated therewith comprising washing said gas with an acid solution of divalent mercury ions, the concentration of which ranges from 0.5 to 100g per liter, at room temperature and atmospheric pressure; and rewashing the resultant gas with an acid solution of divalent mercury ions, the concentration of which ranges from 0.05 to 0.5g per liter, at room temperature and atmospheric pressure to obtain a purified gas containing mercury vapor of less than 0.01 mg/Nm.sup.3, that is, 0.001 ppm.
    Type: Grant
    Filed: October 11, 1974
    Date of Patent: February 22, 1977
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Buntaro Kawase, Iwao Kojima, Juichi Kasai, Keiji Kawasaki
  • Water-reducing admixtures for ceramic pastes
    Patent number: 3931083
    Abstract: Water-reducing additives for ceramic material, and especially for cement paste, mortar or concrete, which comprise a phenolic compound having a sulfo radical or a sulfomethyl radical, wherein the hydrogen atoms of acidic radicals in part of said phenolic compound molecules are substituted by atoms of sodium, potassium or calcium.
    Type: Grant
    Filed: January 30, 1974
    Date of Patent: January 6, 1976
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Isamu Sasaki, Iwao Kojima, Fujio Namigata, Yoku Ashigame, Hiroshi Mihara