Granted Patent
Utility
US 4,481,816 · App. 06/466,158
Pipeline gauging vehicles
Inventor:
Ian Francis Prentice
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Feb 14, 1983
Inventor
Ian Francis Prentice
Assignee (at issue)
British Gas
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.