Granted Patent
Utility
US 6,795,440 · App. 09/272,131
Telecommunications tandem system for circuit-based traffic
Inventors:
Joseph Michael Christie, Michael Joseph Gardner, Albert Daniel DuRee, William L. Wiley, Tracy Lee Nelson
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: Mar 19, 1999
Inventors
Joseph Michael Christie
Michael Joseph Gardner
Albert Daniel DuRee
William L. Wiley
Tracy Lee Nelson
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.