Patents by Inventor William Lee Barnwell

William Lee Barnwell 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 and system for beneficiating gasification slag
    Patent number: 7328805
    Abstract: The present invention provides a method of beneficiating slag, including mixing the slag with water to form a slurry. The slurry is screened through a first screen to remove a first portion of material and then screened through a second screen to remove a second portion of material. In one embodiment, the second portion of material has a carbon content less than about 5% and, more preferably, a carbon content less than about 1%.
    Type: Grant
    Filed: September 8, 2003
    Date of Patent: February 12, 2008
    Assignee: Charah Enviromental, Inc.
    Inventors: Charles E. Price, William Lee Barnwell, John G. Groppo, Jr.