Granted Patent
Utility
US 4,440,890 · App. 06/506,392
Flame retardant poly(aryl ketone)
Inventor:
Lloyd M. Robeson
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: Jun 21, 1983
Inventor
Lloyd M. Robeson
Assignee (at issue)
Union Carbide Corporation
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.