Patents by Inventor Takehiko Baba

Takehiko Baba 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).

  • Process for producing highly pure terephthalic acid
    Patent number: 5420344
    Abstract: A process for producing highly pure terephthalic acid, which comprises heating and dissolving crude terephthalic acid in water, and purifying it by contacting the aqueous solution with hydrogen at a temperature of from 260.degree. to 320.degree. C. in the presence of a platinum group metal catalyst, wherein the purification is initiated within three minutes after the aqueous solution under heating reaches a temperature of 250.degree. C.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: May 30, 1995
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yoshiaki Izumisawa, Tsukasa Kawahara, Yoshiyuki Sumi, Takehiko Baba, Yoshio Ishinaga, Katsuhiko Fukui, Hironori Ohgi