Granted Patent
Utility
US 4,162,021 · App. 05/616,960
Pressure-vacuum relief fuel tank cap with roll-over safety valve feature
Inventor:
Billy G. Crute
Patented Case
View Patent ↗
Granted: Jul 24, 1979
Filed: Sep 26, 1975
Inventor
Billy G. Crute
Assignee (at issue)
Stant Manufacturing Inc.
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.