Patents by Inventor Youn-Seo Lee

Youn-Seo Lee 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).

  • Preparation method of naphthalene dicarboxylic acid
    Publication number: 20060167310
    Abstract: The present invention relates to a method for the preparation of naphthalene dicarboxylic acid, and more particularly, to a method for the preparation of naphthalene dicarboxylic acid by oxidizing dimethylnaphthalene with oxygen in air in the presence of acetic acid solvent using the metal catalysts of cobalt and manganese, and using bromine as a reaction initiator, wherein the temperature of said oxidation reaction is 155 to 180° C. The method for the preparation of naphthalene dicarboxylic acid of the invention enables the preparation of naphthalene dicarboxylic acid having high purity with a high yield in an economical way at a low temperature.
    Type: Application
    Filed: May 2, 2003
    Publication date: July 27, 2006
    Inventors: Jong-In Lee, Han-Seok Kim, Byung-Hee Kim, Hang-Duk Roh, Youn-Seo Lee, Joon-Sang Jo