Patents by Inventor Yil W. Yi

Yil W. Yi 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 copolymer as drug delivery matrix comprising polyethyleneoxide and aliphatic polyester blocks
    Patent number: 5548035
    Abstract: This invention concerns the thermoplastic, biodegradable and nontoxic block copolymer which is easily degraded and excreted in human body by the hydrolysis of intramolecular ester and amide bond. The structure of present copolymer comprises i) hydrophilic and swellable soft domain consisting of polyethyleneoxide(PEO), and ii) hydrophobic, biodegradable, crystallizable and non-swellable hard domain consisting of polylactide(PLA), polyglycolide(PGA), polylactideglycolide(PLdA) and polycaprolactone(PCL).
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: August 20, 1996
    Assignee: Sam Yang Co., Ltd.
    Inventors: Ho H. Kim, Guw D. Yeo, Yil W. Yi
  • Biodegradable hydrogel copolymer as drug delivery matrix
    Patent number: 5514380
    Abstract: This invention concerns the thermoplastic, biodegradable hydrogel copolymer which is easily degraded and excreted in human body by the hydrolysis of intramolecular ester and amide bond. The structure of present copolymer comprises i) hydrophilic and swellable soft domain consisting of polyethyleneoxide (PEO), and ii) hydrophobic, biodegradable, crystallizable and non-swellable hard domain consisting of polylactide (PLA), polyglycolide (PGA), polylactideglycolide (PLGA) and polycaprolactone (PCL).
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: May 7, 1996
    Assignee: Sam Yang Co., Ltd.
    Inventors: Soo S. Song, Ho H. Kim, Yil W. Yi