Granted Patent
Utility
US 6,424,700 · App. 09/458,197
Network based distributed PBX with connection loss survival features
Inventors:
Michel Thibon, Sandrine Millet, Erlé De Pillot, Ian D. Sinclair, Cuthbert Cheung, Aline Gateau
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Dec 9, 1999
Inventors
Michel Thibon
Sandrine Millet
Erlé De Pillot
Ian D. Sinclair
Cuthbert Cheung
Aline Gateau
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.