Patents by Inventor Moon H. Chang

Moon H. Chang 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 preparation of cephalosporin derivatives
    Patent number: 4835267
    Abstract: The present invention relates to an improved process for producing cephalosporin derivatives of formula (I), the 3-position of which being substituted by acetoxymethyl or tetrazolylthiomethyl and the 7-acyl group of which being substituted by D-mandelic acid derivatives, which comprises simultaneously reacting the compound of formula (III) with the compound of formula (IV) in the presence of a compound of formula (II) and anamine in high yield, ##STR1## wherein, R.sup.1 is hydrogen or ##STR2## R.sup.
    Type: Grant
    Filed: January 9, 1987
    Date of Patent: May 30, 1989
    Assignee: Korea Advanced of Institute of Science and Technology
    Inventors: Moon H. Chang, Bong J. Kim, Sung K. Kim, Woan J. Kim