Patent ID: 7601039

Claim:
Electronic interconnection apparatus, comprising: a sacrificial substrate comprising: a surface, a plurality of first trenches formed in the sacrificial substrate and disposed below the surface, a plurality of first sidewalls each connecting the surface and one of the first trenches, wherein each of the first sidewalls is angled with respect to the surface and the one of the first trenches, a plurality of second trenches formed in the sacrificial substrate and disposed below the first trenches, a plurality of second sidewalls each connecting one of the first trenches and one of the second trenches, wherein each of the second sidewalls is angled with respect to the one of the first trenches and the one of the second trenches; and a plurality of spring contact elements residing upon the sacrificial substrate, wherein each of the spring contact elements comprises a first portion disposed on the surface, a second portion disposed on one of the first trenches, and a third portion disposed on one of the second trenches.