Granted Patent
Utility
US 5,169,263 · App. 07/705,708
In-situ soil decontamination process with sub-surface vapor recovery
Inventors:
Paul C. Johnson, David Weingaertner
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: May 23, 1991
Inventors
Paul C. Johnson
David Weingaertner
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.