Granted Patent
Utility
US 4,457,073 · App. 06/425,433
Pipeline pig having improved means of sensing changes in the internal configuration of a pipeline
Inventor:
Larry D. Payne
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Sep 28, 1982
Inventor
Larry D. Payne
Assignee (at issue)
T.D. WILLIAMSON
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.