Compute USPTO trademark filing fees and every statutory window by exact calendar math.
Trademark prosecution runs on a chain of statutory windows - opposition, Statement of Use, Section 8 and combined 8/9 maintenance - and a single missed date can abandon a registration.
A deterministic, client-side calculator multiplies per-class fees and computes every statutory window by exact UTC calendar arithmetic, citing the controlling statute and rule, with nothing uploaded.
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Run the trademark timeline in your browser and route the cited dates into a Sandbox set or a Worklog case. Nothing about the mark is uploaded to anyone's cloud.