Patents by Inventor Lars E. Hedenstierna

Lars E. Hedenstierna 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).

  • Venting device for oil-burning installations
    Patent number: 4570664
    Abstract: The invention relates to a venting device for oil-burning installations. A float arranged in a venting chamber controls both a connection between the venting chamber and the surrounding atmosphere and a connection between the venting chamber and the suction side of an oil pump included in the installation.
    Type: Grant
    Filed: December 14, 1984
    Date of Patent: February 18, 1986
    Assignee: EMA Instrument AB
    Inventors: Nils I. Jonsson, Lars E. Hedenstierna