Patents by Inventor Hendrik Roelof Stapert

Hendrik Roelof Stapert 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).

  • Method of manufacturing a replica as well as a replica obtained by carrying out an UV light-initiated cationic polymerization
    Patent number: 7169828
    Abstract: The invention relates to a method of manufacturing a replica, which method comprises the provision of a polymerizable resin composition between a front mold having a pre-shaped surface and a back mold having a pre-shaped surface, carrying out a curing treatment and removing the replica thus manufactured from the molds. The invention further relates to a replica obtained by carrying out a UV light-initiated cationic polymerization.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: January 30, 2007
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Johan George Kloosterboer, Fredericus Johannes Touwslager, Emile Johannes Karel Verstegen, Hendrik Roelof Stapert
  • 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