Granted Patent
Utility
US 4,847,641 · App. 07/232,814
Piece-wise print image enhancement for dot matrix printers
Inventor:
Charles Tung
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Aug 16, 1988
Inventor
Charles Tung
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.