Granted Patent
Utility
US 6,731,409 · App. 09/773,004
System and method for generating color digital watermarks using conjugate halftone screens
Inventor:
Shen-Ge Wang
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Jan 31, 2001
Inventor
Shen-Ge Wang
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.