Granted Patent
Utility
US 5,657,137 · App. 08/438,294
Color digital halftoning using black and secondary color replacement
Inventors:
Alexander Perumal, Jr., Paul H. Dillinger
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: May 10, 1995
Inventors
Alexander Perumal, Jr.
Paul H. Dillinger
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.