If you sell on Amazon, a patent complaint can take a listing down overnight. Amazon Patent Evaluation Express — usually called APEX — is Amazon's own procedure for resolving those disputes quickly, without a federal lawsuit. It is faster and dramatically cheaper than litigation, but it is also a one-shot process with strict deadlines and a narrow question at issue. This guide explains how APEX works, when it helps, and what a seller on either side of the process should do.
What Amazon Patent Evaluation Express is
APEX is a neutral evaluation program run through Amazon's Utility Patent Neutral Evaluation process. A patent owner who believes a listing infringes a U.S. utility patent can ask Amazon to open an evaluation instead of filing suit. Amazon appoints a neutral patent attorney to decide a single question: is the accused product likely to infringe at least one asserted claim of the patent?
Both sides deposit $4,000 with the neutral. The winner's deposit is refunded; the loser's payment covers the neutral's fee. If the patent owner prevails, the accused listings are removed. If the seller prevails, the listings stay up and the patent owner cannot use the same patent against those ASINs through the program again.
What APEX does not decide
The neutral does not rule on patent validity, damages, willfulness, or antitrust-style counterclaims. Design patents and trade dress are outside the program — only U.S. utility patents qualify. An APEX outcome is not a court judgment and does not bar either side from filing a federal case later. What it does is decide, quickly, who keeps selling in the meantime.
The APEX timeline
Once the patent owner submits a request, Amazon notifies each accused seller. A seller has roughly three weeks to agree to participate and pay the deposit. Declining to participate is not neutral ground — the listing is removed by default. Sellers who opt in then exchange short written arguments with the patent owner: the owner's opening statement, the seller's response with any non-infringement or prior-sale evidence, and the owner's reply. There are no depositions, no discovery, and no live hearing.
From filing to decision, most evaluations conclude in about two to three months. Compare that with a Schedule A case in federal court, where an Amazon seller can face a TRO and a frozen account within days of a complaint being filed and litigation costs run into six figures.
Defending an APEX claim as a seller
The strongest seller defenses are usually technical and specific. Claim charts win these evaluations. Read the asserted claim element by element and show the neutral which element your product lacks — a missing component, a different mechanism, a structural difference the claim language requires. Vague arguments that the patent is “invalid” or “overbroad” go nowhere, because validity is off the table.
The other winning defense is prior sale: if you can document that your product was publicly offered for sale more than one year before the patent's effective filing date, the neutral may find the claim cannot reach you. Preserve invoices, listing histories, and dated packaging.
If your account is already suspended or funds are held because of the complaint, deal with that separately and immediately. Our guides on Amazon IP complaint removal and what to do in the first 24 hours after a suspension walk through those parallel steps.
Using APEX as a patent owner
For brands, APEX is the most efficient enforcement tool Amazon offers for utility patents. It costs a fraction of litigation and produces a removal decision in weeks. It works best where infringement is obvious on the face of the product and the patent claims are clean. Where the claims are complex, or the infringer is a large operation likely to relaunch under new ASINs, federal court and a broader enforcement strategy may still be necessary.
Patent enforcement also pairs with brand-side protections. Sellers with a registered mark should have Brand Registry enrollment in place so trademark and patent tools can be used together.
Common mistakes on both sides
Missing the response deadline is the single most common — and most costly — error, because non-participation means automatic removal. Others include asserting or attacking the wrong claim, submitting marketing copy instead of technical comparison, ignoring the word limits, and treating the neutral's decision as appealable within Amazon. It is not.
When to bring in counsel
APEX compresses a patent infringement analysis into a few written pages judged by a patent attorney. That is exactly the kind of argument that benefits from experienced drafting. If your listing has been targeted, or you hold a utility patent and want infringing products removed, Stockman & Poropat, PLLC handles Amazon patent, trademark, and account matters for sellers and brands nationwide. Contact the firm for a consultation before the response window closes.
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