Granted Patent
Utility
US 5,870,672 · App. 08/628,786
Validation method and apparatus for preventing unauthorized use of cellular phones
Inventors:
Robert Eugene Stoddard, Michael Shaw McKinley
Patented Case
View Patent ↗
Granted: Feb 9, 1999
Filed: Apr 5, 1996
Inventors
Robert Eugene Stoddard
Michael Shaw McKinley
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.