Granted Patent
Utility
US 6,816,578 · App. 09/995,113
Efficient instant messaging using a telephony interface
Inventors:
Thomas J. Kredo, Margaret Avino, Richard G. Bergman
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Nov 27, 2001
Inventors
Thomas J. Kredo
Margaret Avino
Richard G. Bergman
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.