Granted Patent
Utility
US 5,557,539 · App. 08/258,395
Apparatus and method for testing an interactive voice messaging system
Inventor:
Todd M. Fitch
Patented Case
View Patent ↗
Granted: Sep 17, 1996
Filed: Jun 13, 1994
Inventor
Todd M. Fitch
Assignee (at issue)
Centigram Communications Corporation
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.