Granted Patent
Utility
US 4,856,665 · App. 07/284,959
Tamper evident closure with hook-like locking tabs
Inventors:
Herbert V. Dutt, Duane H. Lewis
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Dec 15, 1988
Inventors
Herbert V. Dutt
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.