Granted Patent
Utility
US 5,818,921 · App. 08/616,022
Signaling system and method for enabling PBX-PBX feature transparency across a switched public network
Inventors:
David A. Vander Meiden, Randy Wuerfel
Patented Case
View Patent ↗
Granted: Oct 6, 1998
Filed: Mar 14, 1996
Inventors
David A. Vander Meiden
Randy Wuerfel
Assignee (at issue)
Siemens Business Communication Systems, 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.