Granted Patent
Utility
US 4,579,241 · App. 06/676,497
Tamper evident plastic closure
Inventor:
Thomas H. Hayes
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Nov 29, 1984
Inventor
Thomas H. Hayes
Assignee (at issue)
ANCHOR HOCKING, LLC
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.