Patents by Inventor Hee Sang Chai

Hee Sang Chai 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).

  • Treatment of viral infections by administration of .alpha.-?1-(3-alkylthio-3-deoxy-2-O-acylglyceryl)!-.omega.?5'-(9-arabino sylpurinyl)! diphosphates or purine isosters thereof
    Patent number: 5739120
    Abstract: The present invention relates to new liponucleotide analog compounds having useful antiviral activity, represented by general formula (I): ##STR1## wherein R.sup.1 is a saturated or unsaturated alkyl having 6-22 C atoms; R.sup.2 is a saturated or unsaturated alkyl having 12-20 C atoms; R.sup.3 and R.sup.4 are each hydrogen or hydroxy; and B is one of the nucleoside bases of formula (a): ##STR2## wherein R.sup.5 is a hydrogen, halogen, hydroxy, amino, mercapto, or C.sub.1 -C.sub.4 alkyl amino; R.sup.6 is a hydrogen, halogen or amino; W is a nitrogen or C--R.sup.8 where R.sup.8 is hydrogen, halogen, amino or C.sub.1 -C.sub.4 alkyl, and pharmaceutically acceptable salts thereof.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: April 14, 1998
    Assignee: Boryung Pharmaceutical Co., Ltd.
    Inventors: Woo Hyun Paik, Won Sup Shin, Jae Seung Lee, Hee Sang Chai