Granted Patent
Utility
US 6,364,175 · App. 09/860,512
Pump dispenser piston provided with a plastic inlet check valve insert
Inventor:
Kenneth S. Bloom
Patented Case
View Patent ↗
Granted: Apr 2, 2002
Filed: May 21, 2001
Inventor
Kenneth S. Bloom
Assignee (at issue)
Owens-Illinois Closure 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.