Patents by Inventor Jan U. Kreyenborg

Jan U. Kreyenborg 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).

  • Filter device for extruders having a screen plunger with longitudinally arranged candle filters
    Patent number: 5578207
    Abstract: The invention relates to a filter device for extruders and injection-molding machines, the screen elements being formed by a candle filter and, if required, by a plurality of candle filters, which are arranged in the circumferential direction on the screen plunger, extending parallel to the longitudinal axis of the screen plunger, and are flowed through from the outside inward for filtering purposes and from the inside outward for backwashing purposes.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: November 26, 1996
    Assignee: Firma Kreyenborg Verwaltungen und Beteiligungen KG
    Inventor: Jan U. Kreyenborg