Patent ID: 8141986

Claim:
A heating element of a fluid ejection device comprising: an insulative layer supported on a substrate; two conductive portions, spaced apart from each other, on the insulative layer; and a first resistor portion overlying the insulative layer and defining a pair of opposite side edges, the first resistor portion interposed between the respective conductive portions with each respective side edge spaced apart from one of the respective conductive portions to define a pair of non-resistive side areas extending laterally between each side edge of the first resistor portion and the respective conductive portion; and an upper structure defining a fluid chamber above the first resistor portion, wherein the insulative layer defines a shoulder portion, immediately adjacent each respective side edge of the first resistor portion, the shoulder portion being vertically spaced below a top surface of the first resistor portion by a distance no more than twice a thickness of the first resistor portion.