Granted Patent
Utility
US 5,842,503 · App. 08/911,111
Integrally formed air flow valve
Inventor:
Dennis D. Foley
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Aug 14, 1997
Inventor
Dennis D. Foley
Assignee (at issue)
The Excello Specialty Company
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.