Granted Patent
Utility
US 4,197,955 · App. 05/954,975
Tamper-proof closure
Inventor:
Werner R. Luenser
Patented Case
View Patent ↗
Granted: Apr 15, 1980
Filed: Oct 26, 1978
Inventor
Werner R. Luenser
Assignee (at issue)
Ethyl Products Company
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.