Patents by Inventor Robert A. Frieber

Robert A. Frieber 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).

  • Automatic air inlet control
    Patent number: 4306538
    Abstract: An automatic air inlet control for combustion devices having an inlet for combustion air and a discharge outlet or flue will include, an elongated tubular member defining a flow passage having an inlet and an outlet, the outlet end of the tubular member being connected to the combustion air inlet for said combustion device.
    Type: Grant
    Filed: March 26, 1980
    Date of Patent: December 22, 1981
    Inventor: Robert A. Frieber