Granted Patent
Utility
US 5,924,158 · App. 09/096,017
Pipeline pig
Inventor:
Robert Watts
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Jun 8, 1998
Inventor
Robert Watts
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.