Patents by Inventor Douglas E. Goldsack

Douglas E. Goldsack 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).

  • Mine backfill
    Patent number: 6431796
    Abstract: Backfill for a mine contains a main component of conventional backfill material and a flow enhancing superfine material component mixed with the main component. The superfine material component may be a clay, for example, and has a particle size of less than 1 micron. The superfine component is present in an amount of about 0.5 to 1% by weight to best achieve improved flow without plugging in a pipeline.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: August 13, 2002
    Assignee: Inco Limited
    Inventors: Douglas E. Goldsack, Allan G. Douglas, Wayne N. Lidkea, William A. Manfred