Granted Patent
Utility
US 4,460,708 · App. 06/492,290
Production of activated carbon fibers from acid contacted polybenzimidazole fibrous material
Inventor:
Dagobert E. Stuetz
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: May 6, 1983
Inventor
Dagobert E. Stuetz
Assignee (at issue)
Celanese GmbH
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.