Granted Patent
Utility
US 4,388,227 · App. 06/017,006
Intercalation of graphitic carbon fibers
Inventor:
Ilmar L. Kalnin
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Mar 2, 1979
Inventor
Ilmar L. Kalnin
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.