Granted Patent
Utility
US 4,823,537 · App. 07/052,982
Method of forming a pilferproof closure
Inventor:
James D. Duke
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: May 22, 1987
Inventor
James D. Duke
Assignee (at issue)
Aluminum Company of America
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.