When a patent complaint hits your Amazon listing, one of the tools your attorney may recommend is a non-infringement opinion letter. Sellers often hear the term without a clear picture of what it is or why it helps, so here is a plain-language walk-through.
What the letter actually is
A non-infringement opinion letter is a written analysis from a registered patent attorney explaining why your product does not fall within the claims of a specific patent. It reads the patent claim by claim, compares each part to your product, and shows where your product lands outside the patent’s reach.
It is a considered legal opinion backed by an attorney’s analysis, not a form letter or a simple denial.
Why it helps in an Amazon appeal
Amazon’s appeal process responds better to substance than to argument. A clear opinion from a patent attorney gives Amazon something concrete to weigh, which can support reinstating your listing.
The letter can also show that you acted in good faith. If a dispute ever escalates, having sought and followed a professional opinion can matter to the question of willful infringement.
What goes into a strong opinion
- A close read of the asserted claims, usually starting with the independent claims that define the patent’s scope.
- A claim chart that lines up each claim element against your product.
- A clear conclusion on why one or more required elements are missing from your product.
When it is worth it, and when it is not
An opinion letter makes the most sense when your product genuinely appears to sit outside the patent and the listing is worth defending. If the patent looks strong and your product reads on it, a settlement, license, or design-around may be the smarter spend. A good attorney will tell you which situation you are in before you pay for the letter.
What Amazon typically looks for
Amazon’s reviewers are not judges, and they typically won’t run their own patent analysis. In our experience, a letter gets taken seriously when it:
- Comes from a licensed attorney registered to practice before the USPTO, with credentials Amazon can verify
- Identifies the patent, the ASIN and the complaint ID
- Walks through the asserted claims and shows which elements your product lacks
- Includes clear side-by-side images of the product against the patent figures
- Stays on non-infringement and skips side arguments about where you bought the product or how long you’ve sold it
A letter that just says “our client does not infringe” with nothing behind it is unlikely to help.
When a letter is not the right move
A letter is one path. Depending on the facts, another may be faster or less expensive.
- If the complaint was filed through APEX, Amazon’s patent evaluation program, a neutral evaluator decides the dispute and the process has its own rules and deadlines. We wrote about how APEX works.
- If you were selling the same product before the patent’s priority date, that history may matter more than a claim comparison. Keep your old order records.
- If the patent owner will withdraw the complaint, a retraction typically resolves it cleanly. That sometimes comes out of a direct conversation between attorneys.
And if your product does fall within the claims, a letter saying otherwise won’t hold up. At that point the conversation shifts to designing around the patent, licensing, or challenging the patent itself, which is more like full-blown patent litigation.
If you’re a reseller, read this part twice
Many sellers who get these complaints did not design the product. They bought it from a manufacturer and have an invoice and a sales authorization letter to show for it.
Those documents show where the product came from. They do not show the product avoids the patent. Under US patent law, selling an infringing product can be infringement even if someone else made it. A supplier’s assurance does not change that unless the supplier is the patent owner or holds a license from them.
So the letter still has to be about the product itself. It also helps to ask your supplier early whether they have their own patents, a license, or an opinion from their counsel on this patent.
What to have ready before you call
Pulling this together first will speed things up and keep fees down:
- The Amazon notice, including the complaint ID and patent number
- The ASIN and a link to the listing
- Clear photos of the product from every angle, plus any packaging and instructions
- Product specifications or technical drawings, if you have them
- Your first sale date for this product, with records
- Supplier invoices and any authorization or license paperwork
- Any messages you’ve exchanged with the patent owner or Seller Support
Frequently asked questions
Will a non-infringement opinion get my listing reinstated?
It can. It gives Amazon a substantive basis to reconsider, and it strengthens an appeal, though no single document guarantees reinstatement.
How is this different from just appealing myself?
A self-appeal is your assertion. An opinion letter is a registered patent attorney’s documented analysis of the patent claims, which carries more weight.
Does an opinion letter protect me from a lawsuit?
It does not prevent a suit, but relying on a competent opinion can help rebut a claim of willful infringement if a dispute escalates.
My supplier gave me an authorization letter. Isn’t that enough?
Usually not. It shows you bought the product legitimately. It does not show the product falls outside the patent.
If your listing is down over a patent complaint, our attorneys can review the patent at issue and your product as a paid engagement and advise on which path fits, whether that’s a letter, APEX, or something else. This article is general information, not legal advice.
