Granted Patent
Utility
US 5,209,604 · App. 07/682,172
Soil decontamination
Inventor:
Charles C. Chou
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Apr 9, 1991
Inventor
Charles C. Chou
Assignee (at issue)
SHELL OIL COMPANY
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.