Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
2006-09-26
2006-09-26
Nguyen, Dung Van (Department: 3723)
Abrading
Abrading process
Glass or stone abrading
C451S296000
Reexamination Certificate
active
07112121
ABSTRACT:
A method and apparatus for removing conductive material from a microelectronic substrate. In one embodiment, the method can include engaging a microelectronic substrate with a polishing surface of a polishing pad, electrically coupling a conductive material of the microelectronic substrate to a source of electrical potential, and oxidizing at least a portion of the conductive material by passing an electrical current through the conductive material from the source of electrical potential. For example, the method can include positioning first and second electrodes apart from a face surface of the microelectronic substrate and disposing an electrolytic fluid between the face surface and the electrodes with the electrodes in fluid communication with the electrolytic fluid. The method can further include removing the portion of conductive material from the microelectronic substrate by moving at least one of the microelectronic and the polishing pad relative to the other. Accordingly, metals such as platinum can be anisotropically removed from the microelectronic substrate. The characteristics of the metal removal can be controlled by controlling the characteristics of the electrical signal applied to the microelectronic substrate, and the characteristics of a liquid disposed between the microelectronic substrate and the polishing pad.
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Doan Trung T.
Lee Whonchee
Meikle Scott G.
Moore Scott E.
Micro)n Technology, Inc.
Nguyen Dung Van
Perkins Coie LLP
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