Granted Patent
Utility
US 5,848,155 · App. 08/708,331
Spread spectrum watermark for embedded signalling
Inventor:
Ingemar J. Cox
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: Sep 4, 1996
Inventor
Ingemar J. Cox
Assignee (at issue)
NEC Research Institute, 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.