Granted Patent
Utility
US 4,589,561 · App. 06/690,850
Tamper-proof closure for containers
Inventor:
Clem C. Crisci
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Jan 11, 1985
Inventor
Clem C. Crisci
Assignee (at issue)
Northern Engineering & Plastics, Corp.
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.