Granted Patent
Utility
US 5,084,764 · App. 07/673,678
Pipe inspection system
Inventor:
Robert C. Day
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Mar 22, 1991
Inventor
Robert C. Day
Assignee (at issue)
Northern Telecom Europe Limited
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.