Granted Patent
Utility
US 4,402,150 · App. 06/262,120
Verification device
Inventor:
Paul F. Sullivan
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: May 11, 1981
Inventor
Paul F. Sullivan
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.