Granted Patent
Utility
US 6,252,000 · App. 09/687,598
Highly fluorinated ion exchange/nonfunctional polymer blends
Inventor:
William G. O'Brien
Patented Case
View Patent ↗
Granted: Jun 26, 2001
Filed: Oct 13, 2000
Inventor
William G. O'Brien
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.