Patents by Inventor Naoto Ohsaki

Naoto Ohsaki 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 polyphenylene ether
    Patent number: 6759507
    Abstract: At the time of preparing polyphenylene ether resin, there can be separated and recovered efficiently an aromatic compound solvent, amines making an azeotrope with water (hereafter, referred to as ‘the amines’ for short.) and methanol.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: July 6, 2004
    Assignee: Mitsubishi Gas Chemical Co., Inc.
    Inventors: Kiyoshi Yoshida, Naoto Ohsaki, Hiroya Fujii
  • Method of precipitating polyphenylene ether
    Patent number: 6627727
    Abstract: Polyphenylene ether particles which contain fine powder in a small amount and are easy to handle at the time of molding, are obtained. A method for precipitating polyphenylene ether, which comprises adding a non-solvent for polyphenylene ether to a solution of polyphenylene ether in a good solvent for polyphenylene ether to precipitate polyphenylene ether continuously in a stirring vessel with a reciprocating stirrer, wherein the polyphenylene ether solution is dropped outside the working range of a stirring blade.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: September 30, 2003
    Assignee: Mitsubishi Gas Chemical Co
    Inventors: Kiyoshi Yoshida, Naoto Ohsaki, Hiroya Fujii