Patents by Inventor Joon Hyung Koh

Joon Hyung Koh 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 preparation of cefdinir
    Patent number: 6093814
    Abstract: The present invention relates to a novel crystalline cefdinir intermediate having formula (II) which can be used very usefully for preparing a cephalosporin antibiotics, cefdinir, in which Ph represents phenyl, p-TsOH represents p-toluenesulfonic acid, and DMAC represents N,N-dimethylacetamide, to a process for preparation thereof and to a process for preparing cefdinir using the compound of formula (II). ##STR1## According to the present invention, cefdinir can be prepared in an excellent color and purity and with a good yield.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: July 25, 2000
    Assignee: Hanmi Pharmaceutical Co., Ltd.
    Inventors: Gwan Sun Lee, Young Kil Chang, Jong Pil Chun, Joon Hyung Koh