Granted Patent
Utility
US 5,076,358 · App. 07/400,521
Petroleum recovery with organonitrogen thiocarbonates
Inventor:
Charles L. Kissel
Patented Case
View Patent ↗
Granted: Dec 31, 1991
Filed: Aug 30, 1989
Inventor
Charles L. Kissel
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.