Granted Patent
Utility
US 4,999,158 · App. 07/267,689
Oxidation resistant iron base alloy compositions
Inventor:
John M. Corwin
Patented Case
View Patent ↗
Granted: Mar 12, 1991
Filed: Nov 2, 1988
Inventor
John M. Corwin
Assignee (at issue)
Chrysler Group LLC
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.