Granted Patent
Utility
US 4,837,798 · App. 06/869,277
Communication system having unified messaging
Inventors:
Roberta S. Cohen, Kenneth Mervin Huber, Deborah J. Mills
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jun 2, 1986
Inventors
Roberta S. Cohen
Kenneth Mervin Huber
Deborah J. Mills
Assignees (at issue)
American Telephone and Telegraph, Co.
AT&T Information 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.