Patent ID: 8080443

Claim:
A method of making a device, comprising: forming a first hard mask layer over an underlying layer; forming first features over the first hard mask layer; forming a first spacer layer over the first features; etching the first spacer layer to form a first spacer pattern and to expose top of the first features; removing the first features; patterning the first hard mask, using the first spacer pattern as a mask, to form first hard mask features; removing the first spacer pattern; forming second features over the first hard mask features; forming a second spacer layer over the second features; etching the second spacer layer to form a second spacer pattern and to expose top of the second features; removing the second features; etching the first hard mask features, using the second spacer pattern as a mask, to form second hard mask features; and etching at least part of the underlying layer using the second hard mask features as a mask.