Granted Patent
Utility
US 6,690,779 · App. 09/965,328
Method and apparatus for awarding and redeeming prepaid telephone time
Inventors:
Jay S. Walker, James A. Jorasch, Stephen C. Tulley, Geoffrey M. Gelman, Magdalena M. Fincham
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Sep 27, 2001
Inventors
Jay S. Walker
James A. Jorasch
Stephen C. Tulley
Geoffrey M. Gelman
Magdalena M. Fincham
Assignee (at issue)
Walker Digital, LLC
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.