Patents by Inventor Hang Soo Lee

Hang Soo Lee 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).

  • Method of preparing biodegradable polyester polymer material in the form of filament and sheet using compressed gas
    Patent number: 7511115
    Abstract: Embodiments of the present invention may provide a method of preparing biodegradable polyester polymer materials both in a filament type and a sheet type using a compressed gas. The method of the present invention comprises the following steps: 1) preparing biodegradable polyester polymers through a solution-state polymerization process of a cyclic monomer using a compressed gas as a reaction solvent in the presence of a catalyst; 2) performing a flash-spinning process of the biodegradable polyester polymers prepared above to form a polymer material in a filament type; and 3) performing a calendering process of the polymer material in a filament type prepared above to form a polymer material in a point-bonded sheet type.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: March 31, 2009
    Assignee: Korea Institute of Science & Technology
    Inventors: Soo Hyun Kim, Sang Heon Kim, Cheol Soo Yoon, Se Yoon Kim, Hang Soo Lee
  • Method of preparing biodegradable polyester polymer material in the form of filament and sheet using compressed gas
    Publication number: 20070299236
    Abstract: Embodiments of the present invention may provide a method of preparing biodegradable polyester polymer materials both in a filament type and a sheet type using a compressed gas. The method of the present invention comprises the following steps: 1) preparing biodegradable polyester polymers through a solution-state polymerization process of a cyclic monomer using a compressed gas as a reaction solvent in the presence of a catalyst; 2) performing a flash-spinning process of the biodegradable polyester polymers prepared above to form a polymer material in a filament type; and 3) performing a calendering process of the polymer material in a filament type prepared above to form a polymer material in a point-bonded sheet type.
    Type: Application
    Filed: February 13, 2007
    Publication date: December 27, 2007
    Inventors: Soo Hyun Kim, Sang Heon Kim, Cheol Soo Yoon, Se Yoon Kim, Hang Soo Lee