Granted Patent
Utility
US 4,247,237 · App. 06/045,825
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Inventor:
Ronald L. Brown
Patented Case
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Granted: Jan 27, 1981
Filed: Jun 5, 1979
Inventor
Ronald L. Brown
Assignee (at issue)
Down River International, 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.