Granted Patent
Utility
US 5,440,090 · App. 08/073,030
Duplex stainless steel welding method
Inventors:
Randall L. Davis, William N. Hill
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Jun 7, 1993
Inventors
Randall L. Davis
William N. Hill
Assignee (at issue)
Atlantic Richfield Company
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.