Granted Patent
Utility
US 4,999,052 · App. 07/409,736
Method of producing nitrogen-strengthened alloys
Inventor:
Eric G. Wilson
Patented Case
View Patent ↗
Granted: Mar 12, 1991
Filed: Sep 20, 1989
Inventor
Eric G. Wilson
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.