Patent ID: 7188418

Claim:
A method of forming a heat sink, comprising: providing an extrusion die that includes a plurality of first inwardly extending tongues all having a first length and a plurality of second inwardly extending tongues interspersed with the first tongues, and all having a second length that is shorter than the first length; and extruding a quantity of thermally conductive metal through the extrusion die; wherein: there is a respective one of said second tongues between each adjacent pair of said first tongues, and there is a respective one of said first tongues between each adjacent pair of said second tongues; said first length is measured with respect to each of the first tongues along the tongue from an outermost circumference of the die to a respective tip of the tongue; and said second length is measured with respect to each of the second tongues along the tongue from the outermost circumference of the die to a respective tip of the tongue.