Apparatus and method for in-situ measuring of vibrational...

Measuring and testing – Vibration – By mechanical waves

Reexamination Certificate

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C134S0570DL, C134S113000, C134S184000, C134S902000

Reexamination Certificate

active

07111517

ABSTRACT:
Apparatus and method are provided for in-situ measurement of vibrational energy applied to a wafer in a process bath of a vibrational cleaning system. The apparatus may be made up of a test wafer comprising an array of pressure sensing elements disposed thereon for monitoring power level variation of a time-varying pressure wave. The time-varying pressure wave is indicative of vibrational energy that would be applied to a wafer in the process bath in the position of the test wafer.

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patent: 6450184 (2002-09-01), Azar
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patent: 6629465 (2003-10-01), Maluf et al.
patent: 6691578 (2004-02-01), Puskas
patent: 55159121 (1980-12-01), None

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