Granted Patent
Utility
US 4,633,788 · App. 06/770,695
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Inventor:
James David Robertson
Patented Case
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Granted: Jan 6, 1987
Filed: Aug 29, 1985
Inventor
James David Robertson
Assignee (at issue)
The Mead 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.