Patents by Inventor Robert N. Hazlett

Robert N. Hazlett 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 liquefaction
    Patent number: 4176040
    Abstract: A method for converting coal to liquid hydrocarbons or oil-soluble solids mprises the steps of contacting said coal with oxygen for at least 15 minutes, at a temperature from about 90.degree. to about 225.degree. C., heating the oxidized coal to a temperature from about 250.degree. to about 450.degree. C., and maintaining the temperature for at least 15 minutes.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: November 27, 1979
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Robert N. Hazlett