Patents by Inventor Jun Kokubu

Jun Kokubu 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).

  • Bleaching agent compositions
    Patent number: 6159391
    Abstract: A bleaching agent composition comprising (A) hydrogen peroxide or a peroxide which generates hydrogen peroxide in an aqueous solution, and (B) an addition reaction product of dicyandiamide and a glycidyl ether compound, wherein the pH of the mixed aqueous solution of compound (A) and components (B) becomes at least 7.5.
    Type: Grant
    Filed: December 27, 1999
    Date of Patent: December 12, 2000
    Assignee: S. C. Johnson & Son, Inc.
    Inventors: Tsuneo Kobayashi, Masahito Mikami, Rumi Takano, Yasuhisa Kuriyama, Jun Kokubu, Yasuo Hiro, Yoshiko Tsuji
  • Stabilized aqueous solution of hydrogen peroxide
    Patent number: 5942202
    Abstract: A stabilized aqueous solution of hydrogen peroxide comprising at least one metal element selected from the group consisting of tantalum, zirconium, and niobium.The aqueous solution of hydrogen peroxide has excellent storage stability and heat stability.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: August 24, 1999
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Yoshio Nishimura, Yoshitsugu Minamikawa, Jun Kokubu, Chiharu Nishizawa, Satoshi Okabe, Naoko Matsuya
  • Bleach product
    Patent number: 5929013
    Abstract: A bleach product comprising an aqueous solution at a pH of 8 or more is disclosed that has an excellent bleaching activity without an irritating odor. The aqueous solution comprises: (A) from 0.5 to 60 weight percent of a compound selected from the group consisting of hydrogen peroxide and peroxide compounds which generate hydrogen peroxide in aqueous solution, (B) cyanourea and (C) an alkaline agent has. The product can be used for removal of mold with excellent results.
    Type: Grant
    Filed: March 3, 1998
    Date of Patent: July 27, 1999
    Assignee: Johnson Company Ltd.
    Inventors: Yasuhisa Kuriyama, Jun Kokubu, Yasuo Hiro, Yoshiko Tsuji, Tsuneo Kobayashi, Masahito Mikami, Shuzo Nakamura
  • Method of producing purified aqueous solution of hydrogen peroxide
    Patent number: 5851505
    Abstract: A purified aqueous solution of hydrogen peroxide is produced by contacting an aqueous solution of hydrogen peroxide containing organic impurities with a hydrophilic porous resin (the product under a tradename "WOFATIT EP63", etc.) having a specific surface area of not less than 800 m.sup.2 /g to remove the organic impurities in the aqueous solution of hydrogen peroxide.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: December 22, 1998
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Yoshiyuki Nishide, Yoshitsugu Minamikawa, Jun Kokubu
  • Mold removal composition and mold bleaching method
    Patent number: 5783550
    Abstract: A mold removal composition useful to remove molds adhered to furnishing and walls of homes, particularly kitchen sinks and bathroom walls, ceilings, and tiles, and a mold bleaching method are provided. The mold removal composition contains peroxide, dicyandiamide, alkali metal hydroxide or alkaline-earth metal hydroxide, and water. Its pH is 8.0-13.0.
    Type: Grant
    Filed: July 2, 1997
    Date of Patent: July 21, 1998
    Assignee: S. C. Johnson & Son, Inc.
    Inventors: Yasuhisa Kuriyama, Jun Kokubu, Yasuo Hiro, Yoshiko Tsuji, Tsuneo Kobayashi, Masahito Mikami, Shuzo Nakamura
  • Stabilized particle of sodium percarbonate
    Patent number: 5462804
    Abstract: A stabilized sodium percarbonate particle includes a sodium percarbonate particle having at least one coating layer thereon, wherein the at least one coating layer includes (a) a silicate; (b) magnesium sulfate; and (c) an alkali metal salt selected from the group consisting of alkali metal carbonates, alkali metal bicarbonates and alkali metal sulfate. The present sodium percarbonate particle is good in solubility and is excellent in its formulation stability with detergent.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: October 31, 1995
    Assignee: Mitsubishi Gas Chemical Co., Ltd.
    Inventors: Jun Kokubu, Yasuo Hiro, Katsuhiko Hisano, Susumu Watanabe
  • Method for generation of oxygen gas
    Patent number: 4620970
    Abstract: A method for generating oxygen gas by contacting a peroxygen compound in water with a catalyst composed of a cobalt salt and an organic carboxylic acid or a salt thereof wherein the carboxylic acid has at least one hydroxyl group and at least one carboxyl group.
    Type: Grant
    Filed: November 30, 1984
    Date of Patent: November 4, 1986
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takeo Suzumori, Jun Kokubu, Minoru Kubota