Granted Patent
Utility
US 5,636,271 · App. 08/490,448
Security code selector for telephone access card
Inventors:
Gregory J. Paterno, Patricia D. Croxell
Patented Case
View Patent ↗
Granted: Jun 3, 1997
Filed: Jun 14, 1995
Inventors
Gregory J. Paterno
Patricia D. Croxell
Assignee (at issue)
MCI, LLC
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.