Granted Patent
Utility
US 5,644,632 · App. 08/485,421
Distributed key telephone station network
Inventor:
Menachem T. Ardon
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 7, 1995
Inventor
Menachem T. Ardon
Assignee (at issue)
LUCENT TECHNOLOGIES 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.