Patent ID: 6958536

Claim:
A microelectronic package, comprising: a base; a chip supported by the base; a microelectronic lid over the chip; the chip accordingly being packaged between the microelectronic lid and the base; a thermally conductive connection between the microelectronic lid and the chip; and the lid comprising: a lid material having a shape and a peripheral edge surrounding the shape; the lid material comprising metal-plated copper or metal-plated aluminum: a surface surrounded by the peripheral edge; a rail which extends along only a portion of the peripheral edge and which is elevationally raised relative to the surface; and the shape being a rectangular shape defining four peripheral sides of the peripheral edge, the rail extending along an entirety of two of the peripheral sides and not extending laterally beyond the peripheral edge, while at least a predominate portion of the remaining two sides does not have the rail extending there-along.