Granted Patent
Utility
US 4,213,345 · App. 05/927,944
Pipe inspection system and method
Inventor:
Martin Dufour
Patented Case
View Patent ↗
Granted: Jul 22, 1980
Filed: Jul 25, 1978
Inventor
Martin Dufour
Assignee (at issue)
W. C. Lamb
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.