Granted Patent
Utility
US 4,875,979 · App. 07/164,749
Treatment of petroleum cokes to inhibit coke puffing
Inventors:
Thomas H. Orac, Herbert C. Quandt, David R. Ball
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Mar 7, 1988
Inventors
Thomas H. Orac
Herbert C. Quandt
David R. Ball
Assignee (at issue)
Union Carbide 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.