Patents by Inventor Per N. Hedlund

Per N. Hedlund 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).

  • Arrangement for extraction of harmful gases from workplaces
    Patent number: 5482505
    Abstract: An arrangement for the extraction of harmful gases from workplaces, the arrangement (1) exhibiting a carrier arm system (9) having at least two arms (19, 20, 21) connected telescopically with each other so that the carrier arm system (9) can be given different lengths, whereby the carrier arm system (9) is swivelable around a horizontal spindle (17) so that it can be swivelled in a vertical direction and placed in different positions between a downward-directed, preferably substantially vertical end position and an outward-directed preferably substantially horizontal end position.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: January 9, 1996
    Assignee: AB Ph. Nederman & Co.
    Inventor: Per N. Hedlund
  • Mobile electrostatic air filter for use in welding projects
    Patent number: D329081
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: September 1, 1992
    Assignee: AB Ph. Nederman & Co.
    Inventors: Alf I. S. Jonasson, Per N. Hedlund