Granted Patent
Utility
US 5,229,583 · App. 07/951,954
Surface heating blanket for soil remediation
Inventors:
Cornelis F. Van Egmond, Frederick Gordon Carl, Jr., George Leo Stegemeier, Harold J. Vinegar
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Sep 28, 1992
Inventors
Cornelis F. Van Egmond
Frederick Gordon Carl, Jr.
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.