Granted Patent
Utility
US 4,773,988 · App. 06/910,511
Arsenic removal from shale oil by addition of basic materials
Inventor:
Dennis D. Delaney
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Sep 23, 1986
Inventor
Dennis D. Delaney
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.