Granted Patent
Utility
US 5,656,239 · App. 08/460,403
Method for recovering contaminants from soil utilizing electrical heating
Inventors:
George Leo Stegemeier, Harold J. Vinegar
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Jun 2, 1995
Inventors
George Leo Stegemeier
Harold J. Vinegar
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.