Granted Patent
Utility
US 4,285,242 · App. 06/067,790
Pipe inspection apparatus
Inventor:
Geoffrey C. Braithwaite
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Aug 20, 1979
Inventor
Geoffrey C. Braithwaite
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.