Granted Patent
Utility
US 6,654,600 · App. 09/662,538
Method and apparatus for authorizing use of cellular telephone units
Inventors:
Frederick J. Pollak, Victor Maldonado
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Sep 15, 2000
Inventors
Frederick J. Pollak
Victor Maldonado
Assignee (at issue)
Tracfone Wireless, 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.