Granted Patent
Utility
US 4,177,931 · App. 05/948,424
Breakaway gas cap
Inventor:
John H. Evans
Patented Case
View Patent ↗
Granted: Dec 11, 1979
Filed: Oct 4, 1978
Inventor
John H. Evans
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.