Granted Patent
Utility
US 5,900,082 · App. 08/973,740
Method of making a heat treated steel casting and a heat treated steel casting
Inventor:
Paul Hewitt
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: Dec 11, 1997
Inventor
Paul Hewitt
Assignee (at issue)
NACO, Inc.
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.