Patent ID: 7198353

Claim:
An ink jet printhead, comprising a single substantially planar substrate with heaters on the substrate; first flow features having a first thickness in a height direction substantially perpendicular to the substrate and comprising first ink chambers and first ink supply channels for supplying ink to first selected ones of the heaters; second flow features having a second thickness in the height direction that is different from the first thickness and comprising second ink chambers and second ink supply channels for supplying ink to second selected ones of the heaters; and a nozzle plate, wherein the first flow features and second flow features are adjacent to the single substantially planar substrate, and wherein the nozzle plate has first ink ejection nozzles for ejecting first ink drops each having a first volume and second ink ejection nozzles for ejecting second ink drops each having a second volume different from the first volume, wherein the first volumes are defined by the first flow features and the second volumes are defined by the second flow features.