Patents by Inventor John Charles Whitehead

John Charles Whitehead 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).

  • Patent number: 3970541
    Abstract: Process for the gas extraction of soluble constituents of coal which comprises heating the coal in the presence of an extractor to a terminal temperature of 400.degree.C. to 550.degree.C. where the extractant at the terminal temperature is in the gas phase to extract the soluble constituents from the coal and separating the extractant from the residue and recovering the extract from the extractant. The heating of the coal in the presence of an extractant is at an initial rate of 20.degree.C. per minute and preferably as fast as possible to an initial temperature of 370.degree.C. to 390.degree.C. preferably 380.degree.C. and thereafter heating the coal to a terminal temperature at a rate not more than 20.degree.C. per minute and preferably below 5.degree.C. per minute thereby minimizing secondary repolymerization reactions.
    Type: Grant
    Filed: November 26, 1974
    Date of Patent: July 20, 1976
    Assignee: Coal Industry (Patents) Limited
    Inventors: Derek Farnham Williams, John Charles Whitehead