Granted Patent
Utility
US 6,480,588 · App. 09/436,294
Methods for providing prepaid telephony service via an internet protocol network system
Inventor:
Steven R. Donovan
Patented Case
View Patent ↗
Granted: Nov 12, 2002
Filed: Nov 8, 1999
Inventor
Steven R. Donovan
Assignee (at issue)
Worlds.com, 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.