Granted Patent
Utility
US 5,978,455 · App. 08/862,283
Method and system for determining optimal call periods in accordance with caller and callee parameters
Inventors:
William J. Johnson, Jingsha He
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: May 23, 1997
Inventors
William J. Johnson
Jingsha He
Assignee (at issue)
MCI Communications 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.