Granted Patent
Utility
US 5,663,255 · App. 08/549,407
Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
Inventors:
Colin Anolick, Robert Clayton Wheland
Patented Case
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Granted: Sep 2, 1997
Filed: Oct 27, 1995
Inventors
Colin Anolick
Robert Clayton Wheland
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.