Granted Patent
Utility
US 4,658,073 · App. 06/884,844
Control system for multistage chemical upgrading
Inventor:
Samuel A. Tabak
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Jul 11, 1986
Inventor
Samuel A. Tabak
Assignee (at issue)
Mobil Oil 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.