Granted Patent
Utility
US 4,208,217 · App. 05/945,939
Method of stabilizing aqueous fine coal slurry and product thereof
Inventors:
John Christopher Anderson, David HUTCHINSON, Alvin A. Terchick, Wu-Wey Wen
Patented Case
View Patent ↗
Granted: Jun 17, 1980
Filed: Sep 25, 1978
Inventors
John Christopher Anderson
David HUTCHINSON
Alvin A. Terchick
Wu-Wey Wen
Assignee (at issue)
United States Steel Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.