Granted Patent
Utility
US 5,003,577 · App. 07/334,050
Voice and data interface to a voice-mail service system
Inventors:
Douglas J. Ertz, Larry Friedman, William Katamura, Cheuk W. Kwok, David J. Marinelli
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: Apr 5, 1989
Inventors
Douglas J. Ertz
Larry Friedman
William Katamura
Cheuk W. Kwok
David J. Marinelli
Assignee (at issue)
AT&T Bell Laboratories
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.