Granted Patent
Utility
US 6,208,966 · App. 08/867,773
Telephone network service for converting speech to touch-tones
Inventor:
Andrew Frederick Bulfer
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Jun 2, 1997
Inventor
Andrew Frederick Bulfer
Assignee (at issue)
AT&T CORP.
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.