Patent ID: 7874644

Claim:
A printhead for an inkjet printer, the printhead comprising: a wafer assembly defining a plurality of ink supply channels; and plural groups of ink ejection nozzle arrangements extending from the wafer assembly, each group of ink ejection nozzle arrangements sharing a common ink supply channel, wherein each group of ink ejection nozzle arrangements includes a plurality of ink ejection nozzle arrangements arranged in a pair of rows, each group of ink ejection nozzles includes one ink spread restriction wall shared by the group, the ink spread restriction wall being interposed between each ink ejection nozzle of the group and so as to at least partially surround each ink ejection nozzle of the group, and the shared ink spread restriction wall is spaced apart from each ink ejection nozzle arrangement to define a plurality of ink spread restriction pits between the common ink spread restriction wall and respective ink ejection nozzle arrangements.