Granted Patent
Utility
US 6,833,073 · App. 09/974,637
Composite nanofiltration and reverse osmosis membranes and method for producing the same
Inventor:
Ashok Agarwal
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Oct 9, 2001
Inventor
Ashok Agarwal
Assignee (at issue)
PTI Advanced Filtration, Inc.
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.