Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
2006-03-21
2006-03-21
Wilson, Lee D. (Department: 3723)
Abrading
Abrading process
Glass or stone abrading
C451S285000, C451S286000, C451S287000, C451S288000, C438S689000
Reexamination Certificate
active
07014535
ABSTRACT:
Planarizing machines, carrier heads for planarizing machines and methods for planarizing microelectronic-device substrate assemblies in mechanical or chemical-mechanical planarizing processes. In one embodiment of the invention, a carrier head includes a backing plate, a bladder attached to the backing plate, and a retaining ring extending around the backing plate. The backing plate has a perimeter edge, a first surface, and a second surface opposite the first surface. The second surface of the backing plate can have a perimeter region extending inwardly from the perimeter edge and an interior region extending inwardly from the perimeter region. The perimeter region, for example, can have a curved section extending inwardly from the perimeter edge of the backing plate or from a flat rim at the perimeter edge. The curved section can curve toward and/or away from the first surface to influence the edge pressure exerted against the substrate assembly during planarization. The second surface of the backing plate is a fixed, permanent surface. The backing plate can further include a permanent, low-friction coating over at least a portion of the perimeter region. The bladder is configured to extend over the second surface of the backing plate to form a fluid cell between the bladder and the second surface.
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Custer Daniel G.
Ward Aaron Trent
Dorsey & Whitney LLP
Ojini Anthony
Wilson Lee D.
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