Patents by Inventor Bradley M. Chamberlain

Bradley M. Chamberlain 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).

  • Synthesis of stereospecific and atactic poly(lactic acid)s
    Patent number: 6316590
    Abstract: Isotactic poly ((R)-lactic acid) or isotactic poly (S)-lactic acid are respectively prepared from (R,R)-lactide and (S,S)-lactide using a catalyst which has a zinc center or a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group. Heterotactic poly(lactic acid) is prepared from rac-lactide using a catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group; heterotactic poly(lactic acid) is a novel composition. The catalyst with a magnesium center is a novel catalyst.
    Type: Grant
    Filed: November 8, 2000
    Date of Patent: November 13, 2001
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Geoffrey W. Coates, Ming Cheng, Bradley M. Chamberlain