Patents by Inventor Gordon Dennison

Gordon Dennison 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).

  • Coal extraction
    Patent number: 4997548
    Abstract: Recycled oil solvents for coal extraction have their content of saturated cyclic species reduced by thermal cracking at 470.degree. to 540.degree. C. for a few minutes, restoring their effectiveness as solvents for coal.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: March 5, 1991
    Assignee: Coal Industry (Patents) Limited
    Inventors: Terry D. Rantell, Geoffrey M. Kimber, Gordon Dennison