Patents by Inventor Robert C. W. Chang

Robert C. W. Chang 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: 5374403
    Abstract: An apparatus for incinerating wastes, including an incinerator having a combustion chamber, a fluidtight shell enclosing the combustion chamber, an afterburner, an off-gas particulate removal system and an emergency off-gas cooling system. The region between the inner surface of the shell and the outer surface of the combustion chamber forms a cavity. Air is supplied to the cavity and heated as it passes over the outer surface of the combustion chamber. Heated air is drawn from the cavity and mixed with fuel for input into the combustion chamber. The pressure in the cavity is maintained at least approximately 2.5 cm WC (about 1" WC) higher than the pressure in the combustion chamber. Gases cannot leak from the combustion chamber since the pressure outside the chamber (inside the cavity) is higher than the pressure inside the chamber.
    Type: Grant
    Filed: July 13, 1993
    Date of Patent: December 20, 1994
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Robert C. W. Chang
  • Patent number: 4886001
    Abstract: A method and apparatus for pyrolytically decomposing waste material characterized by injecting a mixture of waste and water into a plasma torch having an operation temperature of in excess of 5000.degree. C. to form a mixture of product gases and solid particulate; separating the gases and particulate in a first cyclone separator into separate phases; transferring the particulate to a second cyclone separator and subjecting the particulate to a partial vacuum to separate any carryover gases from the particulate; subjecting the combined reaction chamber and carry over gases in a scrubber to a spray consisting of a caustic solution and water to eliminate any carryover particulate from the gases and to neutralize and HCl in the gases; and removing the gases from the scrubber.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: December 12, 1989
    Assignee: Westinghouse Electric Corp.
    Inventors: Robert C. W. Chang, Steven C. Vorndran, Michael F. Joseph
  • Patent number: 4870911
    Abstract: An incinerator pyrolyzer for continuously burning waste material characterized by a rotating kiln within a furnace chamber for incinerating waste material passing through the kiln. The kiln includes means for introducing reactants for chemically changing ingredients in the waste material. The furnace also including an outlet for dumping the incinerated residue from the kiln and an outlet for any gas generated during the burning.
    Type: Grant
    Filed: August 5, 1988
    Date of Patent: October 3, 1989
    Assignee: Westinghouse Electric Corp.
    Inventors: Robert C. W. Chang, Steven C. Vorndran, Michael F. Joseph