Granted Patent
Utility
US 4,658,977 · App. 06/789,712
Snap on twist off tamper-proof closure for containers
Inventor:
Robert E. Crisci
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Oct 21, 1985
Inventor
Robert E. Crisci
Assignee (at issue)
(Nepco) Northern Eng. & 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.