Granted Patent
Utility
US 5,825,863 · App. 08/570,443
Prepaid limited usage calling card
Inventor:
Jay S. Walker
Patented Case
View Patent ↗
Granted: Oct 20, 1998
Filed: Jun 17, 1996
Inventor
Jay S. Walker
Assignee (at issue)
Walker Asset Management Limited Partnership
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.