Patents by Inventor Yang K. Han

Yang K. Han 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).

  • Biodegradable poly(lactic acid)s having improved physical properties and process for their preparation
    Patent number: 5434241
    Abstract: This specification provides a biodegradable poly(lactic acid) of a star-shaped structure having a high molecular weight of more than 30,000 with excellent tensile strength and a process for its preparation which comprises direct polycondensation of lactic acid using polyhydroxyl compound having at least four hydroxyl groups.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: July 18, 1995
    Assignee: Korea Institute of Science and Technology
    Inventors: Young H. Kim, Kwang D. Ahn, Yang K. Han, Soo H. Kim, Jeong B. Kim