Granted Patent
Utility
US 6,157,825 · App. 08/520,869
Cellular telephone anti-fraud system
Inventor:
Max B. Frederick
Patented Case
View Patent ↗
Granted: Dec 5, 2000
Filed: Aug 30, 1995
Inventor
Max B. Frederick
Assignee (at issue)
Corsair Communications, Inc.
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.