Granted Patent
Utility
US 6,404,873 · App. 09/204,206
Subconference calling in a telephony-over-LAN environment
Inventors:
William J. Beyda, Shmuel Shaffer
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Dec 1, 1998
Inventors
William J. Beyda
Shmuel Shaffer
Assignee (at issue)
Siemens Information and Communication Networks, 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.