Method and apparatus for photomask plasma etching

Adhesive bonding and miscellaneous chemical manufacture – Differential fluid etching apparatus – With mechanical mask – shield or shutter for shielding workpiece

Reexamination Certificate

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C156S345330, C156S345340, C156S345350, C156S345430, C118S7230ER, C118S7230IR, C118S7230IR, C118S7230MW, C118S7230ER, C118S7230ME

Reexamination Certificate

active

07909961

ABSTRACT:
A method and apparatus for etching photomasks are provided herein. The apparatus includes a process chamber with a shield above a substrate support. The shield comprises a plate with apertures, and the plate has two zones with at least one characteristic, such as material or potential bias, that is different from each other. The method provides for etching a photomask substrate with a distribution of ions and neutral species that pass through the shield.

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