Granted Patent
Utility
US 5,176,207 · App. 07/736,396
Underground instrumentation emplacement system
Inventor:
Carl Keller
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Jul 26, 1991
Inventor
Carl Keller
Assignee (at issue)
Science Engineering Associates, Inc.
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.