Granted Patent
Utility
US 5,615,021 · App. 08/459,143
Print N-tone images with imperceptible dots
Inventor:
Qian Lin
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: Jun 2, 1995
Inventor
Qian Lin
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.