Patent ID: 8157352

Claim:
An apparatus for ejecting droplets of a fluid, comprising: a substrate having a nozzle face and an upper face on a side of the substrate farther from the nozzle face; a first plurality of nozzles formed in a first region of the nozzle face of the substrate; a second plurality of nozzles formed in a second region of the nozzle face, the second region being separated from the first region by a third region of the nozzle face; an inlet for flowing fluid into the substrate and an outlet for flowing fluid out of the substrate both formed in a portion of the upper face of the substrate opposite the third region of the nozzle face, the third region being located between the first region and the second region; and a plurality of fluid paths formed in the substrate and fluidically connecting the first plurality of nozzles and the second plurality of nozzles with the inlet and outlet.