Patents by Inventor Jong-cheon Park

Jong-cheon Park 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 preparing 4-aminodiphenylamine
    Patent number: 7157605
    Abstract: 4-aminodiphenylamine is prepared by reacting carbanilide and nitrobenzene in an adequate solvent, which may be nitrobenzene, in the presence of an appropriate organic base, which may be tetramethylammonium hydroxide, alone or in mixture with an inorganic base and subsequently reducing the reaction product in the presence of an appropriate catalyst and hydrogen gas. The subsequent reduction may be carried out on the reaction mixture before the reaction mixture is subjected to separation.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: January 2, 2007
    Assignee: Korea Kumho Petrochemical Co., Ltd.
    Inventors: Jin-eok Kim, Jong-cheon Park, Kil-sun Lee, Jung-hee Jang
  • METHOD FOR PREPARING 4-AMINODIPHENYLAMINE
    Publication number: 20060258887
    Abstract: 4-aminodiphenylamine is prepared by reacting carbanilide and nitrobenzene in an adequate solvent, which may be nitrobenzene, in the presence of an appropriate organic base, which may be tetramethylammonium hydroxide, alone or in mixture with an inorganic base and subsequently reducing the reaction product in the presence of an appropriate catalyst and hydrogen gas. The subsequent reduction may be carried out on the reaction mixture before the reaction mixture is subjected to separation.
    Type: Application
    Filed: September 14, 2005
    Publication date: November 16, 2006
    Inventors: Jin-eok Kim, Jong-cheon Park, Kil-sun Lee, Jung-hee Jang