Patents by Inventor Narutoshi Hyoudou

Narutoshi Hyoudou 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 producing an aromatic polycarbonate
    Patent number: 6750314
    Abstract: To produce an aromatic polycarbonate excellent in physical properties and hue by a simplified step as compared with a conventional one. A process for producing an aromatic polycarbonate, which comprises the following steps (1) to (3): (1) a step of reacting phenol with acetone in the presence of an acid catalyst to convert part of the phenol into bisphenol A, to obtain a bisphenol A/phenol composition, (2) a step of supplying the bisphenol A/phenol composition held in a molten state in a liquid form to an aromatic polycarbonate production step, and (3) a step of reacting the bisphenol A and a carbonate material to produce an aromatic polycarbonate.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: June 15, 2004
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masaaki Miyamoto, Kiyoji Kuma, Narutoshi Hyoudou, Eiji Fujimoto
  • Process for producing an aromatic polycarbonate
    Publication number: 20030166826
    Abstract: To produce an aromatic polycarbonate excellent in physical properties and hue by a simplified step as compared with a conventional one.
    Type: Application
    Filed: March 26, 2003
    Publication date: September 4, 2003
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Masaaki Miyamoto, Kiyoji Kuma, Narutoshi Hyoudou, Eiji Fujimoto
  • Process for producing diaryl carbonate
    Patent number: 6348613
    Abstract: A process for producing diaryl carbonate of the present invention comprises steps of: (1) a diaryl carbonate production step of subjecting an aromatic monohydroxy compound and phosgene to condensation reaction at a temperature of 80 to 180° C. in the presence of an aromatic nitrogen-containing heterocyclic compound catalyst to obtain the diaryl carbonate; (2) a purification step of removing impurities from a hydrogen chloride gas by-produced upon the condensation reaction; (3) a chlorine recovery step of recovering chlorine usable for the production of phosgene from the purified hydrogen chloride gas; and (4) a phosgene production step of reacting the recovered chlorine with carbon monoxide to obtain phosgene usable in the diaryl carbonate production step.
    Type: Grant
    Filed: December 26, 2000
    Date of Patent: February 19, 2002
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masaaki Miyamoto, Narutoshi Hyoudou
  • Process for producing diaryl carbonate
    Publication number: 20010041806
    Abstract: A process for producing diaryl carbonate of the present invention comprises steps of:
    Type: Application
    Filed: December 26, 2000
    Publication date: November 15, 2001
    Inventors: Masaaki Miyamoto, Narutoshi Hyoudou