Granted Patent
Utility
US 5,089,304 · App. 07/490,030
Method for producing a corrosion resistant article by applying a polybenzimidazole coating
Inventor:
James E. Kuder
Patented Case
View Patent ↗
Granted: Feb 18, 1992
Filed: Mar 7, 1990
Inventor
James E. Kuder
Assignee (at issue)
Hoechst Celanese 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.