Granted Patent
Utility
US 4,481,384 · App. 06/285,654
Voice recognizing telephone call denial system
Inventor:
Terrence H. Matthews
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Jul 21, 1981
Inventor
Terrence H. Matthews
Assignee (at issue)
Mitel 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.