Granted Patent
Utility
US 6,636,616 · App. 09/451,994
Method and apparatus for digital watermarking using error diffusion
Inventor:
Steven J. Harrington
Patented Case
View Patent ↗
Granted: Oct 21, 2003
Filed: Nov 30, 1999
Inventor
Steven J. Harrington
Assignee (at issue)
Xerox 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.