Granted Patent
Utility
US 6,466,912 · App. 08/937,950
Perceptual coding of audio signals employing envelope uncertainty
Inventor:
James David Johnston
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Sep 25, 1997
Inventor
James David Johnston
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.