Granted Patent
Utility
US 6,039,791 · App. 08/956,543
Fused calcined petroleum coke and method of formation
Inventors:
Michael G. Kazeef, Raymond Perruchoud
Patented Case
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Granted: Mar 21, 2000
Filed: Oct 23, 1997
Inventors
Michael G. Kazeef
Raymond Perruchoud
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.