Patents by Inventor Leslie Reggel

Leslie Reggel 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).

  • Removal of mineral matter including pyrite from coal
    Patent number: 3993455
    Abstract: Mineral matter, including pyrite, is removed from coal by treatment of the coal with aqueous alkali at a temperature of about 175.degree. to 350.degree. C, followed by acidification with strong acid.
    Type: Grant
    Filed: June 25, 1973
    Date of Patent: November 23, 1976
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Leslie Reggel, Raphael Raymond, Bernard D. Blaustein