Patents by Inventor Jan R. P. de Fries

Jan R. P. de Fries 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).

  • Dynamic pressure filter
    Patent number: 4900440
    Abstract: The dynamic pressure filter is constructed with a plurality of coaxially disposed rotor sectors and stator sectors. Filter surfaces are mounted on each of the sectors to define annular filter chambers for receiving a suspension to be filtered under pressure. In addition, vortex breakers are provided at the downstream end of each filter chamber for destroying the flow structure of the suspension prior to flow into the downstream filter chamber.
    Type: Grant
    Filed: June 14, 1988
    Date of Patent: February 13, 1990
    Assignee: Sulzer Brothers Limited
    Inventors: Heinrich Ziegler, Jan R. P. de Fries