Patents by Inventor Risto W. Lunden

Risto W. Lunden 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).

  • Patent number: 4136691
    Abstract: A respiration mask comprising a mask portion and a heat exchanger through which inhalation and exhalation air flows for the recovery of humidity and humidity contained in the exhalation air. The heat exchanger consists a continuous strip of wire netting wound helically to form a cylindrical netting roll comprising several turns. The flow of air takes place radially through the netting roll.
    Type: Grant
    Filed: April 8, 1977
    Date of Patent: January 30, 1979
    Assignee: Oy Kontekla
    Inventors: Olavi A. Ebeling, Risto W. Lunden