Granted Patent
Utility
US 5,971,014 · App. 09/086,909
Vacuum breaker valve vent fitting clean-out device
Inventor:
Gary S. Duren
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: May 29, 1998
Inventor
Gary S. Duren
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.