Granted Patent
Utility
US 5,744,657 · App. 08/573,828
Process for the preparation of perfluorocarbons
Inventor:
James L. Webster
Patented Case
View Patent ↗
Granted: Apr 28, 1998
Filed: Dec 18, 1995
Inventor
James L. Webster
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.