Granted Patent
Utility
US 5,334,307 · App. 08/019,776
Resid hydroprocessing catalyst
Inventors:
Howard D. Simpson, Marvin J. Schwedock, John W. Ward
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Feb 19, 1993
Inventors
Howard D. Simpson
Marvin J. Schwedock
John W. Ward
Assignee (at issue)
Union Oil Company of California
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.