Granted Patent
Utility
US 6,524,403 · App. 09/938,234
Non-chrome passivation process for zinc and zinc alloys
Inventors:
Ian G. Bartlett, Ernest Long, Anthony Rowan
Patented Case
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Granted: Feb 25, 2003
Filed: Aug 23, 2001
Inventors
Ian G. Bartlett
Ernest Long
Anthony Rowan
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.