Granted Patent
Utility
US 6,228,445 · App. 09/286,672
Austenitic stainless steel article having a passivated surface layer
Inventor:
John C. Tverberg
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Apr 6, 1999
Inventor
John C. Tverberg
Assignee (at issue)
Crucible Materials 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.