Patents by Inventor Willem Cornelis den Hertog

Willem Cornelis den Hertog 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).

  • Extruder with hydrostatic bearing
    Patent number: 3945621
    Abstract: Extruder, especially a multi-worm extruder with a housing and one or more mixing worms with associated shaft, as well as at least one hydrostatic bearing for absorbing the axial load of the conveying and mixing worm. A slit between a bearing disc on the worm shaft and a counter bearing ring can be filled with oil via a pipe connected to a pump, radial sealings preventing the oil from escaping between the gliding faces of the bearing, whereas the said counter bearing ring is rotatably supported in the extruder housing.
    Type: Grant
    Filed: February 15, 1974
    Date of Patent: March 23, 1976
    Assignee: Wavin B.V.
    Inventors: Willem Cornelis den Hertog, Geert Rolleman