Patent ID: 7500392

Claim:
A microanemometer comprising: a) an electrically conductive resistor formed from a semiconductor wafer doped with an impurity, said resistor having 1) a resistor upper surface; 2) a resistor lower surface having a resistor peripheral edge; 3) resistor sloped sidewalls; wherein the resistor sloped sidewalls are more heavily doped with an impurity than the resistor upper surface; b) a substrate bonded to the semiconductor wafer, said substrate having 1) substrate upper surface; 2) a substrate lower surface; 3) a cavity having a cavity peripheral edge on the substrate upper surface, wherein a plurality of projections formed on the substrate upper surface extend inwardly over the cavity peripheral edge, and wherein the resistor lower surface is supported by at least part of the projections such that the resistor is suspended over the cavity; and c) a plurality of metal conductors in contact with the resistor sloped sidewalls.