Granted Patent
Utility
US 4,453,646 · App. 06/413,348
Closure having frangible means
Inventor:
Niels Aage L. Harrild
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Aug 23, 1982
Inventor
Niels Aage L. Harrild
Assignee (at issue)
Nigu-Pack A/S
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.