Patents by Inventor Pieter Jan Dijkstra

Pieter Jan Dijkstra 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).

  • Copoly(ester-amides) and copoly(ester-urethanes)
    Patent number: 6172167
    Abstract: The invention provide biodegradable copolymers of the copoly(ester-amide) or copoly(ester-urethane) type, which copolymers consist of building blocks with the general structure (I): [CB-VB] wherein CB and VB of different building blocks may be the same or different, and CB represents a block with a constant length and VB represents a block with a variable length.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: January 9, 2001
    Assignee: Universiteit Twente
    Inventors: Hendrik Roelof Stapert, Pieter Jan Dijkstra, Jan Feijen