The catalog

Patent invalidity dossiers.

4,605 patents in the database, sorted by number of on-file litigation cases. Of these, 1,886 have at least one tracked case across 3,914 litigations.

Demand letter analyzer

You got a patent demand letter. Now what?

Paste the letter — we extract the asserted patents, identify the asserter, characterize their litigation history, flag validity vulnerabilities, and draft a sample response letter your attorney can review. Free, private, ~2-3 minutes.

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Analyze a patent

Drop a US patent number — we’ll verify it on Google Patents and generate the full invalidity dossier.

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