Granted Patent
Utility
US 6,046,995 · App. 09/084,190
Key telephone system without common control
Inventors:
Robert Turnbull, David Westergaard, Bruce W. Yee, Michael J. Lucas, Alan D. Eyre, Brian McKinney
Patented Case
View Patent ↗
Granted: Apr 4, 2000
Filed: May 26, 1998
Inventors
Robert Turnbull
David Westergaard
Bruce W. Yee
Michael J. Lucas
Alan D. Eyre
Brian McKinney
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.