Patents by Inventor D. J. Rapp

D. J. Rapp 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).

  • Method for fixing blast/cleaning waste
    Patent number: 5439527
    Abstract: A method for blast cleaning metal and fixing the hazardous waste generated by blast cleaning. An abrasive cement in a sufficient amount is combined with the blast cleaning process, thereby reducing the leachability of the heavy metals and producing non-hazardous abrasive waste.
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: August 8, 1995
    Assignee: The TDJ Group, Inc.
    Inventors: D. J. Rapp, Redmond R. Clark, Michael McGrew
  • Method for fixing blast/cleaning waste
    Patent number: 5266122
    Abstract: A method for blast cleaning metal and fixing the hazardous waste generated by blast cleaning. An abrasive cement in a sufficient amount is combined with the blast cleaning process, thereby reducing the leachability of the heavy metals and producing non-hazardous abrasive waste.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: November 30, 1993
    Assignee: The TDJ Group, Inc.
    Inventors: D. J. Rapp, Redmond R. Clark, Michael McGrew
  • Method of treating metallic oxide impregnated dust
    Patent number: 4878944
    Abstract: A process for treating hazardous particulate generated during a manufacturing process is provided. The process includes the steps of: passing particulate material through at least one duct toward a waste collection device; feeding an additive into the duct to be mixed with the particulate material, upstream from the waste collection device; and passing the particulate material mixed with the additive into the waste collection device. A scrap remelting apparatus is also provided.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: November 7, 1989
    Assignee: The TDJ Group, Inc.
    Inventors: Thomas E. Rolle, D. J. Rapp