Granted Patent
Utility
US 4,667,839 · App. 06/771,675
Snap on tamper indicating closure for containers
Inventor:
Robert E. Crisci
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Sep 3, 1985
Inventor
Robert E. 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.