Granted Patent
Utility
US 6,704,869 · App. 10/202,367
Extracting digital watermarks using logarithmic sampling and symmetrical attributes
Inventors:
Geoffrey B. Rhoads, Ravi K. Sharma
Patented Case
View Patent ↗
Granted: Mar 9, 2004
Filed: Jul 22, 2002
Inventors
Geoffrey B. Rhoads
Ravi K. Sharma
Assignee (at issue)
Digimarc 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.