Granted Patent
Utility
US 5,903,571 · App. 08/726,579
Distributed transit private branch exchange
Inventors:
Richard Koepper, Adoor V. Balasubramanian
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Oct 7, 1996
Inventors
Richard Koepper
Adoor V. Balasubramanian
Assignee (at issue)
Timeplex, 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.