Granted Patent
Utility
US 4,990,209 · App. 07/451,315
Self propelled pipe fusion machine
Inventor:
George Rakes
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Dec 15, 1989
Inventor
George Rakes
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.