Granted Patent
Utility
US 6,760,464 · App. 09/840,016
Halftone watermarking and related applications
Inventor:
Hugh L. Brunk
Patented Case
View Patent ↗
Granted: Jul 6, 2004
Filed: Apr 20, 2001
Inventor
Hugh L. Brunk
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.