Granted Patent
Utility
US 6,771,641 · App. 09/459,044
DTMF digit collection and transportation for a packet network
Inventors:
Patrick N. Sollee, Tahsin Choudhuri, Christopher Haun, Scott L. Orton, Stephen R. Whynot
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Dec 10, 1999
Inventors
Patrick N. Sollee
Tahsin Choudhuri
Christopher Haun
Scott L. Orton
Stephen R. Whynot
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.