Granted Patent
Utility
US 4,278,661 · App. 06/084,632
Purification of interferon
Inventor:
Ernest Knight, Jr.
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Oct 12, 1979
Inventor
Ernest Knight, Jr.
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.