Granted Patent
Utility
US 4,241,840 · App. 06/090,273
Safety closure assembly with a sheet metal overcap
Inventor:
Wilburn C. Willis
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Nov 1, 1979
Inventor
Wilburn C. Willis
Assignee (at issue)
Aluminum Company of America
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.