Patents by Inventor Jurgen Bethkenhagen

Jurgen Bethkenhagen 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).

  • Valved blood sampling device
    Patent number: 4280509
    Abstract: A cannula for blood extraction with a controllable flow includes an injection cannula and a discharge cannula interconnected by a flexible tube wherein the tube is capable of being squeezed tight between the cannulae by a mechanism which applies pressure to the exterior of the flexible tube, the pressure applying mechanism and the tube serving as a valve between the cannulae.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: July 28, 1981
    Inventors: Jurgen Bethkenhagen, Dieter Kolpe