Granted Patent
Utility
US 6,657,992 · App. 09/249,051
System and method for providing service control to a single telephone end terminal from multiple service providers
Inventor:
Samuel H. Christie, IV
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Feb 12, 1999
Inventor
Samuel H. Christie, IV
Assignee (at issue)
Nortel Networks Limited
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.