Granted Patent
Utility
US 5,243,642 · App. 07/729,121
Telephone call management device
Inventors:
Laird Wise, Michael Kendall
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: Jul 12, 1991
Inventors
Laird Wise
Michael Kendall
Assignee (at issue)
Bell Atlantic Network Services
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.