Patents by Inventor Kwan S. Sin

Kwan S. Sin 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).

  • Anti-inflammatory carboxycyclic acetal pregnane derivatives
    Patent number: 5200518
    Abstract: Compounds of the formula: ##STR1## wherein X is H, F, Cl, or CH.sub.3and Y is ##STR2## wherein R.sub.1 is H, alkyl of 1-5 carbon atoms, phenyl, or benzyl;R.sub.2 is COOR.sub.6, R.sub.5 COOR.sub.6, or R.sub.5 CONHR.sub.6 ;R.sub.3 is H, F, OH, or CH.sub.3 ;R.sub.4 is CH.sub.2 OH, CH.sub.2 OCOR.sub.6, COOR.sub.6, or CONHR.sub.6 ;R.sub.5 is alkyl of 1-3 carbon atoms;R.sub.6 is alkyl of 1-5 carbon atoms, or benzyl;represents a single or double bond;.about. represents .alpha.-position, .beta.-position, or a mixture of both .alpha.- and .beta.-positions; and-- represents .alpha.-position;and methods for preparing the same.
    Type: Grant
    Filed: February 21, 1991
    Date of Patent: April 6, 1993
    Assignee: Kangweon National University
    Inventors: Hyun P. Kim, Kwan S. Sin, Chang M. Kim, Moon Y. Heo, Henry J. Lee