Granted Patent
Utility
US 5,117,451 · App. 07/509,089
Interface to and operation of a voice messaging system
Inventors:
David Ladd, Gregory E. Pounds, Tim J. Kusumi, Peter A. Bonee, Robert R. Shepard
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Apr 16, 1990
Inventors
David Ladd
Gregory E. Pounds
Tim J. Kusumi
Peter A. Bonee
Robert R. Shepard
Assignee (at issue)
VMX/OPCOM
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.