Patents by Inventor Mitsuyasu Okamura

Mitsuyasu Okamura 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 the preparation of polycarbonate with reduced levels of fries
    Patent number: 6562433
    Abstract: The present invention provides a composition comprising polycarbonate wherein the polycarbonate has a very low Fries content (e.g., above 5 ppm and below 360 ppm). The present invention also provides a polycarbonate having a very low Fries content which is made by the melt process. This polycarbonate has high ductility and high impact strength. The invention also provides a method for making these compositions. Another aspect of the invention is an optical disk comprising polycarbonate having a very low Fries content which is made by the melt process. Such optical disks resist breakage due to bending.
    Type: Grant
    Filed: September 18, 2000
    Date of Patent: May 13, 2003
    Assignee: General Electric Company
    Inventors: Hiromi Ishida, Kenichi Ishiwa, Mitsuyasu Okamura, Tomoaki Shimoda, Theodorus L. Hoeks, Henricus H. M. van Hout, Monica M. Marugan, Patrick J. McCloskey, Joseph A. King, Jr., Paul M. Smigelski, Jr.