Granted Patent
Utility
US 5,190,175 · App. 07/896,401
Tamper evident closure
Inventor:
Frank Schmidt
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Jun 10, 1992
Inventor
Frank Schmidt
Assignee (at issue)
Continental White Cap, Inc.
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.