Patents by Inventor Etsurou Okamoto

Etsurou Okamoto 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 reusing exhaust gas in polymer production plant
    Patent number: 7449048
    Abstract: The invention provides a method of reusing an inert gas in a polymer production plant by removing impurities such as a polymerization solvent and polymerization monomers from an inert gas discharged from a polymer production plant. The method of reusing an inert gas comprises a step of adsorbing and removing a polymerization solvent and polymerization monomers contained in an inert gas by passing, through an adsorbent layer, an inert gas discharged from a polymer production plant, wherein an inert gas reaching a predetermined purity by removing the polymerization solvent and polymerization monomers in the step of adsorption and removal is reused in the polymer production plant.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: November 11, 2008
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hiroto Nishida, Kenta Tsubohara, Etsurou Okamoto, Yoshiaki Deguchi
  • Method of Reusing Exhaust Gas In Polymer Production Plant
    Publication number: 20060180024
    Abstract: The invention provides a method of reusing an inert gas in a polymer production plant by removing impurities such as a polymerization solvent and polymerization monomers from an inert gas discharged from a polymer production plant. The method of reusing an inert gas comprises a step of adsorbing and removing a polymerization solvent and polymerization monomers contained in an inert gas by passing, through an adsorbent layer, an inert gas discharged from a polymer production plant, wherein an inert gas reaching a predetermined purity by removing the polymerization solvent and polymerization monomers in the step of adsorption and removal is reused in the polymer production plant.
    Type: Application
    Filed: March 19, 2003
    Publication date: August 17, 2006
    Inventors: Hiroto Nishida, Kenta Tsubohara, Etsurou Okamoto, Yoshiaki Deguchi
  • Process and apparatus for producing terephthalic acid
    Patent number: 5463113
    Abstract: A process and an apparatus for producing terephthalic acid economically by oxidizing paraxylene supplied to an oxidizing reactor connected with a compactly designed distillation column in an acetic acid-based solvent, while effecting the distillatory recovery of the paraxylene and acetic acid efficiently without suffering from stuffing of the distillation column.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: October 31, 1995
    Assignee: Mitsui PetrochemicalIndustries, Ltd.
    Inventors: Ryoichi Yamamoto, Fujimasa Nakao, Etsurou Okamoto, Yasuhiko Yagi