Granted Patent
Utility
US 4,662,939 · App. 06/832,292
Process and composition for improved corrosion resistance
Inventor:
John H. Reinshagen
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Feb 21, 1986
Inventor
John H. Reinshagen
Assignee (at issue)
Pfizer Inc.
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.