Granted Patent
Utility
US 4,628,167 · App. 06/749,525
Apparatus for inductively hardneing the interior surface of objects
Inventor:
William D. West
Patented Case
View Patent ↗
Granted: Dec 9, 1986
Filed: Jun 27, 1985
Inventor
William D. West
Assignee (at issue)
Tocco, 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.