Patent ID: 7077493

Claim:
An inkjet printhead comprising: a plurality of nozzles; a plurality of liquid passages leading to each nozzle respectively for providing ejectable liquid to the associated the nozzle; drop ejection actuators and associated drive circuitry corresponding to each nozzle respectively, and; the nozzles, ejection actuators, associated drive circuitry and liquid passage being formed on and through a wafer using lithographically masked etching techniques; wherein, the wafer has a drop ejection side and a liquid supply side; such that, each of the liquid passages is formed by etching a hole partially through the wafer from the drop ejection side, and etching a supply passage from the liquid supply side of the wafer to the hole; wherein, the hole extends past the drive circuitry of the nozzle by a distance that ensures that the drive circuitry is not damaged when the supply passage is etched to the hole.