Granted Patent
Utility
US 5,836,346 · App. 08/959,187
Pilot operated diaphragm fill valve
Inventor:
David Nichols-Roy
Patented Case
View Patent ↗
Granted: Nov 17, 1998
Filed: Oct 28, 1997
Inventor
David Nichols-Roy
Assignee (at issue)
Hunter Plumbing Products
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.