Granted Patent
Utility
US 4,579,240 · App. 06/669,882
Tamper indicating cap assembly
Inventor:
David T. Ou-Yang
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Nov 9, 1984
Inventor
David T. Ou-Yang
Assignee (at issue)
Minnesota Mining and Manufacturing 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.