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USPTO cut the 1(b) intent-to-use extension fee to $125 per class in 2025, so multi-class AI filings now pay that fee for every class and every extension. Independent technical note mirroring the canonical version: https://aitrademarkreview.com/blog/trademark-filing-extensions-how-a-125-fee-changes-multi-class-ai-filings.php
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Ryan Walker (2026) studied this question.
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