An FTO opinion (freedom to operate opinion) is a patent attorney’s written legal conclusion on whether a product or process infringes a valid patent claim in a given country. An FTO search is the factual work that comes first: it finds the patents that could matter, reports their legal status and maps their claims to the product.
The two are often ordered together, but they are separate pieces of work. A search firm supplies the facts through an FTO search, and the attorney supplies the legal judgment, so only the attorney’s document is an opinion.
This article compares the two and lists what the search report has to contain before an opinion can be built on it.
FTO search vs FTO opinion at a glance
| Point | FTO search | FTO opinion |
|---|---|---|
| What it establishes | Which patents and applications have claims that may cover the product | Whether the product infringes a valid claim of those patents |
| Prepared by | A patent searcher with a background in the technology | Normally a patent attorney qualified in the country concerned |
| Typical content | Ranked patents, legal status, families, claim charts and the search record | Claim construction, infringement analysis, validity where needed and a reasoned conclusion |
| Main use | Design decisions, attorney review and due diligence | Board and investor decisions, and evidence of good faith in US litigation |
A search without an opinion still has value, because it shows which patents exist and when they expire. An opinion without a search rests on whichever patents happen to be known.
What an FTO search report contains
The freedom to operate search guide describes the method in full. The searcher breaks the product into features and searches the claims of patents that are in force or pending in the countries of interest. The results are screened on the independent claims, and the FTO search report then records:
- the scope: features, countries, time window and databases;
- the relevant patents and applications, ranked by risk;
- the legal status and expected expiry of each patent, by country;
- claim charts that compare each claim element with the product;
- the search record, with strings, classifications and hit counts.
The focus on claims that are in force or pending separates an FTO search from the other types, as a separate comparison of patentability, FTO and invalidity searches explains.
What an FTO opinion adds to the search
The opinion starts where the report stops: the attorney reads the higher-risk patents in full, with their prosecution history, and decides what each disputed claim term means. A court has the final word on the meaning of a claim, so the attorney predicts how a court would read it.
The attorney then applies the law of the country concerned, and a typical opinion covers:
- literal infringement, element by element;
- infringement by equivalents, and any limit that the prosecution history places on it;
- indirect infringement, for example by supplying only a component;
- validity, often supported by a separate patent invalidity search;
- a reasoned conclusion for each patent.
An opinion which concludes that no claim is infringed is called a non-infringement opinion. An invalidity opinion concludes that the relevant claims should not have been granted.
Why the FTO opinion matters in US litigation
A US court may increase the damages for patent infringement up to 3 times the amount assessed (35 U.S.C. 284). In Halo Electronics v. Pulse Electronics (2016), the Supreme Court limited such awards, as a general rule, to egregious conduct such as wilful infringement.
The same decision measures culpability against what the company knew at the time it acted. An opinion obtained before launch is therefore evidence of the company’s state of mind at the moment that counts. The search report matters here too, because it may show that the company knew of a patent.
US law does not require an opinion, however. Under 35 U.S.C. 298, a failure to obtain the advice of counsel, or to present it in court, cannot be used to prove wilful infringement or intent to induce infringement.
What the attorney needs from a search firm
An attorney can rely only on a search whose limits are visible, so the report has to let the attorney check the work without repeating it. The 6 points below separate a report that supports an FTO opinion from one that has to be redone. Neutral wording, covered in the next section, is a seventh.
- A dated product description, so that the search and the opinion refer to the same design version.
- The full search record, from which the attorney states the scope of the opinion.
- Claim charts with sources, in which each claim element sits beside the product feature and its source document.
- Legal status with a date, naming the register consulted and the day of the check.
- Pending family members, since continuations and divisionals can still produce new claims.
- Open points, such as claim terms with more than one reasonable reading.
Why an FTO search report avoids legal conclusions
In US litigation, the discovery rules let the other side obtain, within limits, relevant documents that are not privileged or otherwise protected, and a search report may be among them. A sentence in it which says that the product infringes may later be used against the company.
The following wording is an illustration and does not describe a real project.
| Legal conclusion | Factual observation |
|---|---|
| “The product infringes claim 1.” | “Each element of claim 1 was found in the product description, as chart 3 shows.” |
| “This patent is not a problem.” | “Claim 1 requires a valve. No valve was identified in the product.” |
| “The patent is invalid.” | “The closest earlier document found is listed in section 5.” |
Privilege is the second reason. The Federal Circuit recognised a privilege for registered patent agents in In re Queen’s University at Kingston (2016). It also stated that the privilege does not cover an agent’s opinion on infringement. FTO searches are often commissioned through the attorney, who decides how the report is addressed and who receives it. Privilege rules differ between countries, so this is a decision for counsel.
The usual order of work
The work runs in 5 steps, and the cost follows the same split.
- The attorney and the company agree the features and the countries.
- The search firm searches and delivers the report.
- The attorney selects the patents that need full analysis.
- The attorney writes the opinion on those patents.
- The search is updated before launch, and the opinion is revised if needed.
As a reference point, FTO searches at Synoptic IP cost USD 800–4,000 (checked October 2026). The opinion is charged separately by the law firm.
Search support for an FTO opinion
Synoptic IP conducts freedom to operate searches for patent attorneys and in-house IP teams, with claim charts and a record of the search strings and databases. If you are preparing an FTO opinion, send us the product description and the countries through our FTO search service page for a proposal on method and cost.
This guide is general information and is not legal advice.
Frequently Asked Questions
Who can write an FTO opinion?
In practice, an FTO opinion is written by a patent attorney qualified in the country whose patents are analysed. A search firm supplies the report and the claim charts, but not a legal conclusion. In the US, registration as a patent agent covers practice before the patent office (37 CFR 11.5). When defining the patent-agent privilege, the Federal Circuit said that an opinion on infringement is not incident to that practice.
How much does an FTO opinion cost?
The fee is set by the law firm and is separate from the search fee. It depends mainly on the number of patents that need full analysis, the number of countries and the complexity of the technology. Limiting the opinion to the patents ranked as high risk is the usual way to control the cost.
How long does an FTO opinion stay current?
An FTO opinion is current only for the product and the date that it describes. A design change can bring a new claim into play, and new patents are granted every week. The search is therefore updated before launch and before entry into a new country, and the attorney then confirms or revises the opinion.
Can a patent office give an opinion on infringement?
Only on a narrow question. The UK Intellectual Property Office, for example, offers a non-binding opinion on a UK patent for a fee of GBP 250 (checked October 2026). An examiner considers whether a specific act infringes the patent, or whether the patent is valid. The request has to relate to an identified patent, so the service does not replace a search.
Does a favourable FTO opinion prevent a lawsuit?
No. An opinion is advice, and the patent owner can still sue. A court may read a claim differently from the attorney, and an application that was unpublished at the search date cannot be found. A reasoned opinion lowers the risk and, in the US, can help to show that the company acted in good faith.