Patents Assigned to The TDJ Group, Inc.
  • 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