Patents by Inventor Robert R. Dulac

Robert R. Dulac 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).

  • Oil burner shutter
    Patent number: 4477248
    Abstract: An oil burner shutter to block off an oil burner from a wood/coal boiler when not in use having a movable shutter with an aperture therein and means to move said shutter to an open or closed position including means to operate said shutter automatically in conjunction with said oil burner and the boiler's aquastat and damper.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: October 16, 1984
    Inventor: Robert R. Dulac
  • Wood-burning boiler
    Patent number: 4303198
    Abstract: A wood boiler surrounded on five sides by a water jacket with a series of water-carrying pipes forming a grate adapted to hold the wood while burning and an exhaust pipe extending through the top of the water jacket beside a tankless coil for producing hot water, and a return duct provided at the junction of the exhaust pipe and the chimney adapted to return condensates to the combustion chamber.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: December 1, 1981
    Inventor: Robert R. Dulac