Granted Patent
Utility
US 6,526,155 · App. 09/449,356
Systems and methods for producing visible watermarks by halftoning
Inventors:
Shen-Ge Wang, Keith T. Knox
Patented Case
View Patent ↗
Granted: Feb 25, 2003
Filed: Nov 24, 1999
Inventors
Shen-Ge Wang
Keith T. Knox
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.