Patents by Inventor Dirk W. Grijpma

Dirk W. Grijpma 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).

  • Copolymer of lactone and carbonate and process for the preparation of such a copolymer
    Patent number: 5492997
    Abstract: A copolymer of a lactone and a polycyclic carbonate is prepared by heating a monomer of a lactone with a polycyclic carbonate having two cyclic structures including a carbonate group at elevated temperatures less than 200 degrees Centigrade in the presence of a catalyst. The described copolymers evidence excellent mechanical properties, good resorption velocity and do not disintegrate upon degradation into materials of high crystallinity.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: February 20, 1996
    Assignee: Rijksuniversiteit te Groningen
    Inventors: Dirk W. Grijpma, Erik Kroeze, Atze J. Nijenhuis, Albertus J. Pennings