Patents by Inventor Piet Dijkstra

Piet 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).

  • Process for making a bioprosthetic device and implants produced therefrom
    Patent number: 6117979
    Abstract: Bioprosthetic devices made of collagen-based material having collagen amine groups and collagen carboxyl groups are provided as well as methods for their formation. The methods comprise combining an epoxy functionalized crosslinking agent with the collagen-based material in an aqueous medium at an acidic pH to react a portion of the collagen carboxyl groups with the epoxy functionalized crosslinking agent to form crosslinked collagen-based material comprising residual collagen carboxyl groups.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: September 12, 2000
    Assignee: Medtronic, Inc.
    Inventors: Marc Hendriks, Michel Verhoeven, Patrick Cahalan, Raymond Zeeman, Piet Dijkstra, Jan Feijen