Patents by Inventor Nam J. Lee

Nam J. 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).

  • Process for the production of (.+-.)-4-oxo-1,2,3,6,7,11b-hexahydro-4H-pyrazino[2,1-a]isoquinoline derivatives
    Patent number: 4497952
    Abstract: This invention discloses a process for the preparation of (.+-.)-4-oxo-1,2,3,6,7,11b-hexahydro-4H-pyrazino[2,1-a]isoquinoline derivatives which comprises conducting an intramolecular cyclization reaction of the compounds of formulas II III in an acid medium.
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: February 5, 1985
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Choong S. Kim, Nam J. Lee, Joong H. Kim