Granted Patent
Utility
US 4,396,500 · App. 06/167,679
Hydrotreating process
Inventor:
Howard D. Simpson
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Jul 11, 1980
Inventor
Howard D. Simpson
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.