Patents by Inventor David R. Hopper

David R. Hopper 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).

  • Simplified apparatus for decontaminating electrical apparatus contaminated with PCBs
    Patent number: 5082012
    Abstract: Energy efficient apparatus of compact size and configuration for the decontamination of the PCB contaminated fluid removed from transformers is disclosed. The apparatus includes a fluid circulation loop with a side stream to a distillation means followed by a venturi for reintroducing the vapors of distillation into the circulating loop of contaminated fluid.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: January 21, 1992
    Assignee: Ensr Corporation
    Inventors: Michael J. Massey, David R. Hopper, Mark N. DeDecker
  • Apparatus and method for reclassifying electrical apparatus contaminated with PCB
    Patent number: 4814021
    Abstract: A method for cleaning and reclassifying electrical apparatus designed for use with PCB fluid electrolytes is described which is capable of operation on the site of the equipment being cleaned and while said equipment is energized.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: March 21, 1989
    Assignee: ENSR Corporation
    Inventors: Michael J. Massey, David R. Hopper