Granted Patent
Utility
US 5,228,728 · App. 07/809,688
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Inventors:
James L. McNaughton, Mark G. Ketcham
Patented Case
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Granted: Jul 20, 1993
Filed: Dec 17, 1991
Inventors
James L. McNaughton
Mark G. Ketcham
Assignee (at issue)
Huron Products Industries, 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.