Patents by Inventor Frederick W. Heunermund

Frederick W. Heunermund 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).

  • Device for filtering sewer gases
    Patent number: 5316569
    Abstract: A device for filtering sewer gases includes a main body member and lower and upper filter medium chambers. The lower chamber contain carbon as the filter medium and the upper chamber contains copper steel wool and a silver coil as a filter medium. An adapter member is fixed to the main body member for connection to a house sewer vent.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: May 31, 1994
    Inventor: Frederick W. Heunermund