Patents by Inventor Erling Normann

Erling Normann 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).

  • Ventilation device
    Patent number: 5375649
    Abstract: Ventilation device with a heat exchange element, preferably for arrangement in an outer wall (13) of premises which are to be ventilated with balanced volumes of ambient air (15). The ventilation device comprises a pair of air flow passages (23A,23B) each including two separate ventilation tubes (16,19) aligned in the direction of air flow, with generally identical heat exchange elements (18,22) at the ends thereof. A fan (24A,24B) is located centrally between the two heat exchange elements in each passage.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: December 27, 1994
    Inventors: Trond Nilsen, Erling Normann