Granted Patent
Utility
US 5,645,221 · App. 08/459,725
Trigger sprayer having air vent sleeve with integral check valve
Inventor:
Donald D. Foster
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Jun 2, 1995
Inventor
Donald D. Foster
Assignee (at issue)
Contico International, LLC
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.