Granted Patent
Utility
US 4,499,164 · App. 06/606,580
Image carrying media employing an optical barrier
Inventor:
William T. Plummer
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: May 3, 1984
Inventor
William T. Plummer
Assignee (at issue)
Polaroid 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.