Granted Patent
Utility
US 4,770,446 · App. 07/035,670
Pressure tank connector with internal crimped tank attachment
Inventor:
Russell D. Keller
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Apr 8, 1987
Inventor
Russell D. Keller
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.