Patent ID: 8449081

Claim:
An inkjet printhead comprising: a wafer substrate defining a planar support surface; a plurality of ink chambers adjacent the planar support surface of the wafer substrate, the ink chambers being defined by sidewalls extending between a nozzle plate and the wafer substrate, one of the sidewalls of each chamber having an opening to allow ink to refill the chamber, each ink chamber having a nozzle opening and an actuator for ejecting ink through the nozzle opening upon activation; an ink conduit between the nozzle plate and the wafer substrate, the ink conduit being in fluid communication with the openings of the plurality of the ink chambers; and a plurality of ink inlets defined in the wafer substrate, each of the ink conduits receiving ink to supply to the ink chambers from at least one of the ink inlets, each of the ink inlets having an ink permeable trap and a vent sized so that the surface tension of an ink meniscus across the vent prevents ink leakage; wherein during use, the ink permeable trap directs gas bubbles to the vent where the gas bubbles vent to atmosphere.