Patents by Inventor Anton Ettenhofer

Anton Ettenhofer 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).

  • Metering apparatus for pourable bulk material
    Patent number: 6318418
    Abstract: A worm metering apparatus which includes a metering tube having an end, the end has an annular barrier element, made of sintered metal, that communicates with a negative-pressure source and an overpressure source gas source. A pressure meter is also provided, which measures the negative pressure that prevails in a line to the barrier element. To prevent the barrier element from becoming clogged with bulk material particles, the overpressure gas is conducted to the barrier element during the operation of the worm metering apparatus, in order to detach adhering particles of bulk material.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: November 20, 2001
    Assignee: Robert Bosch GmbH
    Inventors: Guenter Grossmann, Anton Ettenhofer