Granted Patent
Utility
US 4,909,669 · App. 07/273,847
Pipeline joint protector
Inventor:
Ralph Thomas Baker
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Nov 21, 1988
Inventor
Ralph Thomas Baker
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.