Patents by Inventor Per Nitteberg

Per Nitteberg 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).

  • Ventilator with heat exchanger
    Patent number: 4196771
    Abstract: A ventilator having a rotating drumlike heat exchanging fan and a housing with separation walls and a stationary conical member arranged in the hollow of the fan. Separation walls cooperating with external and internal sides of the fan have lips arranged according to the specification.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: April 8, 1980
    Assignee: A/S Norlett
    Inventor: Per Nitteberg