Granted Patent
Utility
US 4,590,799 · App. 06/590,764
Pipeline pig tracking
Inventors:
Robert C. Brown, John McIntyre
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Mar 19, 1984
Inventors
Robert C. Brown
John McIntyre
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.