Granted Patent
Utility
US 5,656,099 · App. 08/411,632
Method of forming oxide passivation film having chromium oxide layer on the surface thereof, and stainless steel having excellent corrosion resistance
Inventor:
Tadahiro Ohmi
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Mar 30, 1995
Inventor
Tadahiro Ohmi
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.