Patents by Inventor Åke Ralvert

Åke Ralvert 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).

  • Apparatus for cleaning a filter cloth in a filtering device
    Patent number: 6596166
    Abstract: Apparatus for cleaning a filter cloth in a filtering device with a rotatable drum having an inlet for the liquid to be filtered. The drum has in its circumferential surface openings through which the liquid to be filtered is conducted in a filtering direction out of the drum for filtering through a filter cloth. The cleaning apparatus includes at least one spray nozzle which is adapted to spray cleaning liquid onto a portion of the filter cloth in a direction opposite to the filtering direction. Moreover the apparatus comprises a driving device for providing a reciprocating motion of the spray nozzle. The driving device has a coupling which is adapted to transform the rotary motion of the drum into the reciprocating motion of the spray nozzle, with such a ratio that the rotary motion of the drum and the reciprocating motion of the spray nozzle are out of phase with each other.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: July 22, 2003
    Assignee: Hydrotech Nils-Ake Persson AB
    Inventors: Åke Danielsson, Åke Ralvert
  • Module for construction of a rotary disc filter
    Patent number: D497660
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: October 26, 2004
    Assignee: Hydrotech Nils-Ake Persson Aktiebolag
    Inventors: Åke Danielsson, Åke Ralvert, Emil Svensson, Per Larsson