Patents by Inventor Tuneyasu Sato

Tuneyasu Sato 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).

  • Process for removing anthraquinone type scale
    Patent number: 4561935
    Abstract: A process for removing an anthraquinone type scale comprises condensing a steam evaporated from a black liquor obtained by separating pulp from a digested mixture of lignocelluloses containing an anthraquinone type digesting assistant; and contacting a heated aqueous solution of a base in the presence or absence of a reducing agent or an alkali resistant surfactant with a wall of a condenser of an evaporator on which said anthraquinone type scale is adhered.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: December 31, 1985
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Kazuaki Sakai, Tuneyasu Sato, Kazuhiko Chiba
  • Process for removing anthraquinone type scale
    Patent number: 4481073
    Abstract: A process for removing an anthraquinone type scale comprises condensing a steam evaporated from a black liquor obtained by separating pulp from a digested mixture of lignocelluloses containing an anthraquinone type digesting assistant; and contacting a heated aqueous solution of a base in the presence or absence of a reducing agent or an alkali resistant surfactant with a wall of a condenser of an evaporator on which said anthraquinone type scale is adhered.
    Type: Grant
    Filed: November 19, 1981
    Date of Patent: November 6, 1984
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Kazuaki Sakai, Tuneyasu Sato, Kazuhiko Chiba
  • Purification of naphthoquinone
    Patent number: 4257851
    Abstract: A crude naphthoquinone produced by an oxidation of naphthalene is purified by a reduced pressure distillation of a crude 1,4-naphthoquinone having an acid content of less than 5 equivalent % calculated as monobasic acid and the crude naphthoquinone is preferably treated by an oxidation of oxidizable impurities.
    Type: Grant
    Filed: March 22, 1979
    Date of Patent: March 24, 1981
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Ryo Matsuura, Kazuaki Sakai, Tuneyasu Sato, Yorinobu Yamada, Kowzo Bandow