Patents by Inventor Poong Man Lee

Poong Man 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).

  • Para-chlorination of aromatic compound
    Patent number: 6028232
    Abstract: The present invention relates to a catalyst for preparing para-chloro aromatic compounds by the liquid-phase chlorination method. The catalyst is prepared by loading transition metal salts, rare earth metal salts or a mixture thereof, and alkali metal or alkaline earth metal chlorides having a melting point of 300.degree. C. or more, by solid-state method or impregnation method, into zeolite L being ion-exchanged by alkali metal. The present invention also relates to a process for preparing para-isomers of the chlorinated compounds by using the catalyst.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: February 22, 2000
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Sang Eon Park, Jung Whan Yoo, Poong Man Lee