Patents by Inventor Seung Sub Choi

Seung Sub Choi 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 preparing cephem derivative
    Patent number: 5700932
    Abstract: The present invention relates to a process for preparing a cephem derivative represented by the following formula (I): ##STR1## useful as an intermediate for the preparation of antibiotics.
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: December 23, 1997
    Assignee: Cheil Jedang Co.
    Inventors: Kwang Hyuk Lee, Seung Sub Choi, Myeong Sik Yoon