Granted Patent
Utility
US 4,285,491 · App. 06/103,799
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Inventors:
Anthony R. Bonta, Charles J. Gasche
Patented Case
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Granted: Aug 25, 1981
Filed: Dec 14, 1979
Inventors
Anthony R. Bonta
Charles J. Gasche
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.