Patents by Inventor Shigero Yamamoto

Shigero Yamamoto 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 precipitation of polyphenylene ether
    Patent number: 7342088
    Abstract: Method for precipitating polyphenylene ether which decreases fine particles therein and reduces periodic fluctuations in particle size. Method provides homogeneous polyphenylene ether particles. Polyphenylene ether particles are precipitated using mixed solution comprising good solvent for polyphenylene ether and poor solvent for polyphenylene ether. Method employs precipitation tank equipped with draft tube, stirring blade, baffle(s), solution supply port, poor solvent supply port, and exhaust port. Polyphenylene ether particles and poor solvent are added to mixed solution comprising good solvent and circularly flowed by rotation of stirring blade, polyphenylene ether solution for solution supply port, and poor solvent for poor solvent supply port, thereby precipitating polyphenylene ether particles having desired properties.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: March 11, 2008
    Assignees: Asahi Kasei Chemicals Corporation, Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shigero Yamamoto, Mutsumi Maeda, Yuji Takeda