Granted Patent
Utility
US 5,743,872 · App. 08/841,287
Limited backflow reflux valve and method
Inventor:
Larry Kelly
Patented Case
View Patent ↗
Granted: Apr 28, 1998
Filed: Apr 29, 1997
Inventor
Larry Kelly
Assignee (at issue)
LIEBEL-FLARSHEIM COMPANY 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.