Patent ID: 7527721

Claim:
A fabrication process for forming a multi-layer three-dimensional structure, comprising: (a) supplying a substrate which comprises a porous dielectric having connected regions of dielectric material with spaces located between the regions and having a first sacrificial material located within at least some of the spaces; (b) forming a first layer comprising a pattern of at least one structural material which contacts only a portion of the dielectric regions and occupies at least a portion of the openings between some of the dielectric regions and further comprises at least one sacrificial build material; (c) forming each of a plurality of layers of patterned material on a previously formed layer, wherein each layer comprises at least one structural material and at least one sacrificial build material; and (d) after formation of the plurality of layers, removing at least part of the first sacrificial material from the spaces and at least a portion of the at least one sacrificial build material from the plurality of layers.