Granted Patent
Utility
US 6,141,556 · App. 09/320,994
Telecommunications system with multi-extension services
Inventors:
Angus O. Dougherty, Charles I. Cook, David G. Robinson, Giuliana Pritchard
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: May 27, 1999
Inventors
Angus O. Dougherty
Charles I. Cook
David G. Robinson
Giuliana Pritchard
Assignee (at issue)
Qwest Communications International Inc.
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.