Granted Patent
Utility
US 5,664,009 · App. 08/553,784
Voice mail notification system
Inventors:
Robert L. Hurst, Steven A. Fernald
Patented Case
View Patent ↗
Granted: Sep 2, 1997
Filed: Oct 23, 1995
Inventors
Robert L. Hurst
Steven A. Fernald
Assignee (at issue)
Allnet Communication Services, 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.