Patents by Inventor Yutaka Asada

Yutaka Asada 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).

  • Diaryl carbonate product and production of polycarbonate
    Patent number: 6472498
    Abstract: A composition consisting essentially of a diaryl carbonate and contains a furan ring-containing compound in an amount of not more than 1 ppm is favorably employable for producing less colored polycarbonate.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: October 29, 2002
    Assignee: Ube Industries, Ltd.
    Inventors: Ryoji Sugise, Shuji Tanaka, Kohichi Kashiwagi, Takashi Doi, Hirofumi Ii, Masayuki Nishio, Shinichi Yoshida, Yutaka Asada, Kazuo Miyamoto
  • Diaryl carbonate product and production of polycarbonate
    Publication number: 20020019512
    Abstract: A composition consisting essentially of a diaryl carbonate and contains a furan ring-containing compound in an amount of not more than 1 ppm is favorably employable for producing less colored polycarbonate
    Type: Application
    Filed: August 6, 2001
    Publication date: February 14, 2002
    Applicant: Ube Industries, Ltd.
    Inventors: Ryoji Sugise, Shuji Tanaka, Kohichi Kashiwagi, Takashi Doi, Hirofumi Ii, Masayuki Nishio, Shinichi Yoshida, Yutaka Asada, Kazuo Miyamoto
  • Process for continuously producing dimethyl carbonate
    Patent number: 5631396
    Abstract: Dimethyl carbonate ((CH.sub.3 O).sub.2 CO) is continuously produced by a catalytic reaction (first step) of CO with CH.sub.3 NO.sub.2, with a significantly reduced loss of CH.sub.3 ONO by the process including a second step wherein (CH.sub.3 O).sub.2 CO in a reaction product gas of the first step is absorbed by dimethyl oxalate while contacting the resultant liquid fraction with CO to recover CH.sub.3 ONO, a third step wherein CH.sub.3 ONO is regenerated from NO in the condensed gas fraction produced in the second step and molecular oxygen and CH.sub.3 OH introduced into the third step, the resultant regenerated gas fraction being recycled and reused as a feed gas for the first step, and a fourth step wherein (CH.sub.3 O).sub.2 CO contained in the liquid fraction of the second step is collected.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: May 20, 1997
    Assignee: Ube Industries, Ltd.
    Inventors: Keigo Nishihira, Shinichi Yoshida, Shuji Tanaka, Yutaka Asada