Granted Patent
Utility
US 6,228,963 · App. 09/441,927
Copolymers of maleic anhydride or acid and fluorinated olefins
Inventors:
Robert Clayton Wheland, Paul Douglas Brothers, Colin Anolick, Charles W. Stewart
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Nov 18, 1999
Inventors
Robert Clayton Wheland
Paul Douglas Brothers
Colin Anolick
Charles W. Stewart
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.