Granted Patent
Utility
US 4,299,247 · App. 06/107,977
Fuel tank vent
Inventor:
Russell D. Keller
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Jan 3, 1980
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.