Granted Patent
Utility
US 6,639,977 · App. 09/640,831
System and method for reverse billing of a telephone call
Inventors:
Bobb Swope, Donald B. Vaello
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Aug 17, 2000
Inventors
Bobb Swope
Donald B. Vaello
Assignee (at issue)
Evercom 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.