Patents by Inventor Chun G. Kim

Chun G. Kim 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 trimellitic acid
    Patent number: 5171881
    Abstract: It is a process for producing trimellitic acid (trimellitic acid, 1, 2, 4-tricarboxylic acid) by oxidizing pseudocumene with a molecular oxygen containing gas. More particularly, pseudocumene is oxidized into trimellitic acid by introducing a molecular oxygen containing gas in an acetic acid solvent in the presence of oxidizing catalysts, wherein the oxidization reactions in two different stages which have different ranges of temperature and different compositions of catalyst, respectively.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: December 15, 1992
    Assignee: Yukong Limited
    Inventors: Sang H. Park, Jae S. Go, Jung W. Sim, Chun G. Kim