Granted Patent
Utility
US 4,468,619 · App. 06/414,927
Non-destructive detection of the surface properties of ferromagnetic materials
Inventor:
Richard Reeves
Patented Case
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Granted: Aug 28, 1984
Filed: Sep 3, 1982
Inventor
Richard Reeves
Assignee (at issue)
British Gas
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.