Granted Patent
Utility
US 5,073,923 · App. 07/630,580
Private telephone system with unified command feature
Inventors:
Albert G. Offers, Christopher D. White, Roderick B. Story
Patented Case
View Patent ↗
Granted: Dec 17, 1991
Filed: Dec 20, 1990
Inventors
Albert G. Offers
Christopher D. White
Roderick B. Story
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.