Granted Patent
Utility
US 4,678,523 · App. 06/882,552
Corrosion- and wear-resistant duplex steel
Inventors:
Narasi Sridhar, Paul Anthony Crook
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Jul 3, 1986
Inventors
Narasi Sridhar
Paul Anthony Crook
Assignee (at issue)
Cabot 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.