Granted Patent
Utility
US 6,483,909 · App. 10/044,485
System and method for providing service assurance for prepaid telecommunication services
Inventors:
Minh Duy Khuc, Carl M. Coppage
Patented Case
View Patent ↗
Granted: Nov 19, 2002
Filed: Jan 11, 2002
Inventors
Minh Duy Khuc
Carl M. Coppage
Assignee (at issue)
SPRINT COMMUNICATIONS COMPANY, L.P.
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.