Granted Patent
Utility
US 6,486,975 · App. 09/260,047
Method and device for recognizing tones and sequences thereof
Inventors:
Eric Verreault, John C. Fischer
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Mar 2, 1999
Inventors
Eric Verreault
John C. Fischer
Assignee (at issue)
Alcatel Canada Inc.
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.