Patents by Inventor Takayoshi Anamizu

Takayoshi Anamizu 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 for manufacturing polycarbonate
    Patent number: 6455667
    Abstract: The present invention provides a method for manufacturing polycarbonate with excellent dwell stability (e.g., thermal stability and hue stability) during melting and molding, as well as with a low content of impurities. The present invention further relates to a method for manufacturing polycarbonate wherein the molten polycarbonate is filtered through a passivation treated metal filter.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: September 24, 2002
    Assignee: General Electric Company
    Inventors: Takato Kimura, Takayoshi Anamizu, Satoru Minami, Tomoaki Shimoda
  • Method for quenching of catalyst in the production of low molecular weight polycarbonates
    Patent number: 6177536
    Abstract: Improved performance in high temperature, high vacuum reactors is obtained by quenching alkaline catalyst present in the product a melt polycondensation reaction using a sulfonic acid ester quencher in a carrier. The carrier if formed from a first carrier component effective to solubilize the quencher and having a lower boiling point than the quencher, and a second carrier component soluble in the first carrier component and having a higher boiling point than the quencher. An exemplary carrier composition contains equal parts of diphenylcarbonate and toluene.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: January 23, 2001
    Assignee: General Electric Company
    Inventors: Takayoshi Anamizu, Akio Kanezawa, Tomoaki Shimoda, Raphael Mestanza