Granted Patent
Utility
US 4,151,458 · App. 05/820,379
Closely spaced pipe-to-soil electrical survey method and apparatus
Inventor:
William H. Seager
Patented Case
View Patent ↗
Granted: Apr 24, 1979
Filed: Jul 29, 1977
Inventor
William H. Seager
Assignee (at issue)
HARCO, LLC
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.