Granted Patent
Utility
US 5,317,418 · App. 08/060,285
Halftone images using special filters
Inventor:
Qian Lin
Patented Case
View Patent ↗
Granted: May 31, 1994
Filed: May 11, 1993
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.