Granted Patent
Utility
US 4,215,794 · App. 06/053,623
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Inventors:
Leon L. Lewis, Michael Murray
Patented Case
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Granted: Aug 5, 1980
Filed: Jun 29, 1979
Inventors
Leon L. Lewis
Michael Murray
Assignee (at issue)
United States Steel Corporation
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.