Granted Patent
Utility
US 6,661,785 · App. 09/416,054
Method and apparatus for providing internet call waiting with voice over internet protocol
Inventors:
Li Zhang, Jeffrey Cassanova, Alan Blackburn, Robert B. Collicott
Patented Case
View Patent ↗
Granted: Dec 9, 2003
Filed: Oct 12, 1999
Inventors
Li Zhang
Jeffrey Cassanova
Alan Blackburn
Robert B. Collicott
Assignee (at issue)
BELLSOUTH INTELLECTUAL PROPERTY CORPORATION
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.