Patents by Inventor Katsuo Nogami

Katsuo Nogami 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 producing polybutylene terephthalate
    Patent number: 6060579
    Abstract: A method for producing polybutylene terephthalate comprising continuously esterifying a dicarboxylic acid component consisting essentially of terephthalic acid with a diol component consisting essentially of 1,4-butanediol followed by polycondensing the resulting oligomer, wherein the esterification is effected in a molar ratio, P, of the diol component to the dicarboxylic acid component to fall between 1.1 and 1.6, in the presence of a combination of an organic titanium compound and an organic tin compound that satisfies the following requirement:amount of organic titanium compound (mol %).ltoreq.0.08.times.P-0.07where P=molar ratio of diol component to dicarboxylic acid component, and is followed by the polycondensation.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: May 9, 2000
    Assignee: Toray Industries, Inc.
    Inventors: Hiroyuki Ohme, Motoki Hiratsuka, Katsuo Nogami