Granted Patent
Utility
US 5,114,497 · App. 07/675,377
Soil decontamination
Inventors:
Paul C. Johnson, James D. Colthart, Arthur L. Otermat, David Weingaertner, Charles C. Chou, Dallas Lea Byers, Stephen Merle Stearns, Arnold R. Marsden, Jr., George M. Deeley
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Mar 26, 1991
Inventors
Paul C. Johnson
James D. Colthart
Arthur L. Otermat
David Weingaertner
Charles C. Chou
Dallas Lea Byers
Stephen Merle Stearns
Arnold R. Marsden, Jr.
George M. Deeley
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.