Granted Patent
Utility
US 6,771,640 · App. 09/910,682
Virtual calling card with arbitrary controls
Inventors:
Murali M. Karamchedu, Jeffrey B. Sponaugle
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Jul 20, 2001
Inventors
Murali M. Karamchedu
Jeffrey B. Sponaugle
Assignee (at issue)
ITXC, 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.