Patents by Inventor Christopher Martin Qwalchmai

Christopher Martin Qwalchmai 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).

  • Eccentric screw-type pump
    Publication number: 20040028546
    Abstract: An eccentric screw-type pump has a pump section with a tubular pump casing, a stator cladding and a pump cavity (30) configured in correspondence with a double-thread or multi-thread screw. A screw-type rotor is connected to a driving shaft via a flexible shaft. The flexible shaft is connected at its two ends via rigid coupler elements to the rotor and the driving shaft, and is surrounded by a preloaded coaxially disposed screw.
    Type: Application
    Filed: February 24, 2003
    Publication date: February 12, 2004
    Inventors: Reinhard Denk, Bernhard Murrenhoff, Christopher Martin Qwalchmai, Johann Kreidl