Granted Patent
Utility
US 4,907,900 · App. 07/000,698
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Inventor:
Howard C. Duncan IV
Patented Case
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Granted: Mar 13, 1990
Filed: Jan 6, 1987
Inventor
Howard C. Duncan IV
Assignee (at issue)
Smith Corona Corp.
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.