Patents by Inventor Per Otto Andersson

Per Otto Andersson 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).

  • Device in ventilation ducts provided with adjustable filter means
    Patent number: 7066974
    Abstract: The invention relates to an arrangement of ventilation plants including ducts in which bag filters or similar bag-shaped filters (4) made of filter gauze are mounted. For individual adjustment of the air throughflow capacity of the filters the effective length of the filters is adjusted which, according to the invention, is carried out by an actuating member (23) which is axially pressed against the end portion of the filter (4) directly or by use of a casing of net material enclosing the filter, which casing has two ends axially fixed and is pursed up by a ring-shaped member of the actuating member (23).
    Type: Grant
    Filed: October 23, 1998
    Date of Patent: June 27, 2006
    Inventor: Per Otto Andersson
  • Ventilation arrangement, including filter constructed as sound dampener, flow damper and for filtering purposes
    Patent number: 5766072
    Abstract: A ventilation plant comprising fans for distribution of intake air and exhaust air in branch ducts having openings for the intake air and exhaust air. Tubular filters are sealingly attached to the openings and create a pressure drop of about 200 Pascal, which filters at flow velocities adjusted to about 2-5 m/s are acting also as throttling and sound damping devices of the plant.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: June 16, 1998
    Assignee: P.O. Andersson Konstruktionsbyra AB
    Inventor: Per Otto Andersson