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If I run the string “reliable ACK” (in double quotes) on Google Patents, the first hit in the results is US7158802, filed on 19 Feb 2003.

But if I apply the date restriction as filed before July 03, 2003, and then run the same string, I get no results, not even US7158802.

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Mahesh Maan

Team Lead, Prior Art – GreyB

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