Granted Patent
Utility
US 6,724,869 · App. 09/919,160
Multimodal telephone numbers
Inventors:
Robert Ellis Chapman, Jr., Asser Nasreldin Tantawi, Edith H. Stern, Barry E. Willner
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Jul 31, 2001
Inventors
Robert Ellis Chapman, Jr.
Asser Nasreldin Tantawi
Edith H. Stern
Barry E. Willner
Assignee (at issue)
International Business Machines 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.