Granted Patent
Utility
US 6,497,151 · App. 09/467,314
Non-destructive testing method and apparatus to determine microstructure of ferrous metal objects
Inventors:
Kenneth J. Watts, David M. Winslett
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: Dec 20, 1999
Inventors
Kenneth J. Watts
David M. Winslett
Assignee (at issue)
U.S. Pipe and Foundry 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.