Patents by Inventor Werner Durr

Werner Durr 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).

  • Vacuum cleaner with constant air flow
    Patent number: 4399585
    Abstract: A vacuum cleaner with constant air flow for household and industrial purposes. The vacuum cleaner includes a suction fan driven by an electric motor. An air flow measuring device is arranged in the working air flow of the suction fan, and has an electrical output signal proportional to the air flow. This electrical output signal is conveyed to a regulating and control circuit which adjusts the working air flow to a predetermined value as a function of the output signal.
    Type: Grant
    Filed: September 7, 1981
    Date of Patent: August 23, 1983
    Assignee: Progress-Elektrogerate Mauz & Pfeiffer GmbH & Co.
    Inventors: Gunter R. J. Kullik, Werner Durr, Robert Maier