Patents by Inventor Frank J. Derbyshire

Frank J. Derbyshire 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).

  • Liquefaction of coal
    Patent number: 4428818
    Abstract: Solvent refining of coal is conducted with a blend of coals calculated to maintain the phenols of the steady state recycle solvent within desired limits.
    Type: Grant
    Filed: December 7, 1982
    Date of Patent: January 31, 1984
    Assignee: Mobil Oil Corporation
    Inventors: Frank J. Derbyshire, Darrell D. Whitehurst