Granted Patent
Utility
US 4,576,097 · App. 06/667,392
Pipeline inspection vehicles
Inventor:
John Foster
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Nov 2, 1984
Inventor
John Foster
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.