Granted Patent
Utility
US 6,503,448 · App. 09/321,354
Process for retarding the formation of corrosion on metal surfaces
Inventors:
Charles D. Kuhfeldt, James M. Bryson
Patented Case
View Patent ↗
Granted: Jan 7, 2003
Filed: May 27, 1999
Inventors
Charles D. Kuhfeldt
James M. Bryson
Assignee (at issue)
Ashland, 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.