Granted Patent
Utility
US 4,463,869 · App. 06/520,508
Tamper-evident spice can lid
Inventor:
Duane H. Lewis
Patented Case
View Patent ↗
Granted: Aug 7, 1984
Filed: Aug 4, 1983
Inventor
Duane H. Lewis
Assignee (at issue)
Continental Plastic Corp.
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.