Patents by Inventor William B. Tolman

William B. Tolman 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).

  • Polymer synthesis from macrocycles
    Patent number: 7714097
    Abstract: A synthetic route is provided to prepare poly(?-hydroxycarboxylic acid) polymers via the ring-opening polymerization of ?-hydroxycarboxylic acid cyclic oligomers. The cyclic oligomers can be prepared directly from biorenewable sources, such as 3-hydroxypropionic acid. The method can be used to prepare high molecular weight polymers from the cyclic oligomers. Good molecular weight control can be obtained for both solution state and melt polymerizations.
    Type: Grant
    Filed: October 6, 2006
    Date of Patent: May 11, 2010
    Assignee: Regents of the University of Minnesota
    Inventors: Donghui Zhang, William B. Tolman, Marc A. Hillmyer