Patents by Inventor Terry D. Rantell

Terry D. Rantell 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
  • Coal extraction
    Patent number: 4521291
    Abstract: Coal is extracted using a mixed solvent which includes a substantially aromatic component and a substantially naphthenic component, at a temperature of 400.degree. to 500.degree. C. Although neither component is an especially good solvent for coal by itself, the use of mixed solvent gives greater flexibility to the process and offers efficiency gains.
    Type: Grant
    Filed: April 4, 1984
    Date of Patent: June 4, 1985
    Assignee: Coal Industry (Patents) Limited
    Inventors: James W. Clarke, Geoffrey M. Kimber, Terry D. Rantell, Colin E. Snape
  • Coal extraction
    Patent number: 4487682
    Abstract: Coal extracts from hydrogenative liquid extraction of coals can be more easily and more quickly filtered if the extraction is carried out at a temperature over 420.degree. C. and the resulting extract is fractionated using a cut point in the range 200.degree. to 300.degree. C. to remove low boiling material. The product is then filtered to give a filtrate containing less than 0.1% by weight of mineral matter.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: December 11, 1984
    Assignee: Coal Industry (Patents) Limited
    Inventors: James W. Clarke, Geoffrey M. Kimber, Terry D. Rantell