Patents by Inventor Peter Rietsch

Peter Rietsch 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).

  • Hydrodynamic machine
    Patent number: 6612805
    Abstract: A hydrodynamic machine such as an agitator or a pump has a seal at the fluid medium side in the form of a sliding ring in a coaxial opening in the impeller wheel hub. To prevent particle deposits and blockages in the region of the seal the hub engages into a pot-shaped opening in the housing, forming a conical outwardly enlarging annular gap. Formed on the outside of the hub is a spiral means which when the hub rotates produces a fluid flow outwardly of the annular gap to counteract a deposit of contaminating matter such as particles and fibers from the fluid in the annular gap and thus also at the seal.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: September 2, 2003
    Assignee: EMU Unterwasserpumpen GmbH
    Inventor: Peter Rietsch
  • Hydrodynamic machine
    Publication number: 20020071761
    Abstract: A hydrodynamic machine such as an agitator or a pump has a seal at the fluid medium side in the form of a sliding ring in a coaxial opening in the impeller wheel hub. To prevent particle deposits and blockages in the region of the seal the hub engages into a pot-shaped opening in the housing, forming a conical outwardly enlarging annular gap. Formed on the outside of the hub is a spiral means which when the hub rotates produces a fluid flow outwardly of the annular gap to counteract a deposit of contaminating matter such as particles and fibers from the fluid in the annular gap and thus also at the seal.
    Type: Application
    Filed: November 27, 2001
    Publication date: June 13, 2002
    Inventor: Peter Rietsch
  • Propeller
    Patent number: D457850
    Type: Grant
    Filed: July 6, 2001
    Date of Patent: May 28, 2002
    Assignee: EMU Unterwasserpumpen GmbH
    Inventor: Peter Rietsch
  • Propeller
    Patent number: D459285
    Type: Grant
    Filed: July 6, 2001
    Date of Patent: June 25, 2002
    Assignee: EMU Unterwasserpumpen GmbH
    Inventor: Peter Rietsch