Patents by Inventor Hans Dünn

Hans Dünn 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).

  • Dry operating screw-type compressor with pneumatically controlled air relief valve
    Patent number: 8002527
    Abstract: A screw-type compressor having a motor driven and dry operating compressor unit. A butterfly valve is disposed in an intake line connected to the suction side of the compressor unit. An adjustment cylinder mechanically shifts the butterfly valve. A pressure line is connected to the pressure side of the compressor unit and, via the interposition of a check valve, is connected to a compressed air system. The pressure line is connected to a pneumatically controlled air relief valve via an air relief line for relief of pressure during idling of the compressor unit. At least during idling, the air relief valve is adapted to be acted upon by the pressure that is effective on the pressure side of the compressor unit.
    Type: Grant
    Filed: August 30, 2006
    Date of Patent: August 23, 2011
    Assignee: Dienes Werke Fur Maschinenteile GmbH & Co.
    Inventor: Hans Dünn