Patents by Inventor Katuhiro Iura

Katuhiro Iura 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).

  • Production method of polycarbonate
    Patent number: 5777064
    Abstract: A method of producing a polycarbonate excellent in the hue, the thermal stability, and the electrolysis stability by supplying a polycarbonate obtained by a transesterification method to an extruder having vent(s), melting the polycarbonate, and adding an acidic compound to the molten polycarbonate followed by kneading to continuously devolatilize low molecular weight compounds remaining in the polycarbonate. Better result is obtained by adding water to the kneaded mixture of the polycarbonate and the acidic compound before devolatilizing the low molecular weight compounds.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: July 7, 1998
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Katsushige Hayashi, Tsutomu Kawakami, Yuji Takeda, Katuhiro Iura