Granted Patent
Utility
US 4,531,765 · App. 06/221,201
Color coded ID cards
Inventor:
Joseph Shulman
Patented Case
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Granted: Jul 30, 1985
Filed: Dec 29, 1980
Inventor
Joseph Shulman
Assignee (at issue)
Polaroid Corporation, Patent Dept.
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.