Granted Patent
Utility
US 6,404,866 · App. 09/436,977
Telephone calling account system and method
Inventors:
Eric Hopper, Keith E. Steele, Douglas M. Fieldhouse
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Nov 9, 1999
Inventors
Eric Hopper
Keith E. Steele
Douglas M. Fieldhouse
Assignee (at issue)
Vesta Corporation
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.