Granted Patent
Utility
US 5,662,793 · App. 08/583,405
Valve assembly of a reverse osmosis water purification system
Inventor:
Richard W. Beall, Jr.
Patented Case
View Patent ↗
Granted: Sep 2, 1997
Filed: Jan 5, 1996
Inventor
Richard W. Beall, Jr.
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.