Granted Patent
Utility
US 6,339,640 · App. 09/215,260
Method and apparatus for automatic callback in a telecommunication system
Inventors:
Julie Chen, Dany Sylvain
Patented Case
View Patent ↗
Granted: Jan 15, 2002
Filed: Dec 18, 1998
Inventors
Julie Chen
Dany Sylvain
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.