Granted Patent
Utility
US 4,257,848 · App. 06/025,970
Apparatus for producing blast furnace coke by coal compaction
Inventors:
William E. Brayton, Fay Fun, Luther G. Hendrickson, Ronald W. Shoenberger
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Apr 2, 1979
Inventors
William E. Brayton
Fay Fun
Luther G. Hendrickson
Ronald W. Shoenberger
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.