Patent ID: 8657411

Claim:
A fluid ejection device comprising: a nozzle plate, the nozzle plate comprising a plurality of nozzles configured therewithin for fluid ejection; a flow feature layer configured below the nozzle plate, the flow feature layer comprising a plurality of flow features, each flow feature of the plurality of flow features configured in fluid communication with at least one nozzle of the plurality of nozzles; and an ejection unit configured below the flow feature layer, the ejection unit comprising, a first layer configured below the flow feature layer, the first layer comprising a plurality of fluid vias configured therewithin, each fluid via of the plurality of fluid vias configured in fluid communication with at least one flow feature of the plurality of flow features, a second layer configured below the first layer, the second layer comprising a plurality of fluid channels, each fluid channel of the plurality of fluid channels configured in fluid communication with at least one fluid via of the plurality of fluid vias, the second layer being attached to the first layer through a first intermediate silicon oxide layer, and a third layer configured below the second layer, the third layer comprising silicon and having a plurality of ports, at least one port of the plurality of ports configured in fluid communication with a corresponding fluid channel of the plurality of fluid channels, the third layer being attached to the second layer through a second intermediate silicon oxide layer.