Granted Patent
Utility
US 4,796,777 · App. 07/138,150
Vented fuel tank cap and valve assembly
Inventor:
Russell D. Keller
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Dec 28, 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.