Patents by Inventor Paul M. Yavorsky

Paul M. Yavorsky 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).

  • Method of extracting coal from a coal refuse pile
    Patent number: 5035722
    Abstract: A method of extracting coal from a coal refuse pile comprises soaking the coal refuse pile with an aqueous alkali solution and distributing an oxygen-containing gas throughout the coal refuse pile for a time period sufficient to effect oxidation of coal contained in the coal refuse pile. The method further comprises leaching the coal refuse pile with an aqueous alkali solution to solubilize and extract the oxidized coal as alkali salts of humic acids and collecting the resulting solution containing the alkali salts of humic acids. Calcium hydroxide may be added to the solution of alkali salts of humic acid to form precipitated humates useable as a low-ash, low-sulfur solid fuel.
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: July 30, 1991
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventor: Paul M. Yavorsky