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.
A search firm supplies the facts through an FTO search, and the attorney supplies the legal judgment.
FTO search vs FTO opinion at a glance
| Point | FTO search | FTO opinion |
|---|---|---|
| What it establishes | Which patents may cover the product | Whether the product infringes a valid claim |
| Prepared by | A patent searcher | Normally a patent attorney |
| Typical content | Ranked patents, legal status, claim charts and the search record | Claim construction, infringement analysis, validity and a reasoned conclusion |
As a reference point, FTO searches at Synoptic IP cost USD 800–4,000 (checked October 2026), and the opinion is charged separately by the law firm.
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 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;
- claim charts and the search record.
A separate article compares patentability, FTO and invalidity searches.
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 typical opinion covers literal infringement, infringement by equivalents, indirect infringement and validity, often supported by a separate patent invalidity search. It ends with a reasoned conclusion for each patent.
An opinion which concludes that no claim is infringed is called a non-infringement opinion.
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, while the search report 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. A report that supports an FTO opinion usually has:
- a dated product description of the design searched;
- the full search record, from which the attorney states the scope of the opinion;
- claim charts with sources for each product feature;
- legal status with a date and the register consulted;
- 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.” |
Privilege is the second reason. The Federal Circuit recognised a privilege for registered patent agents in In re Queen’s University at Kingston (2016), but stated that it does not cover an agent’s opinion on infringement. FTO searches are often commissioned through the attorney, who decides who receives the report.
Search support for an FTO opinion
Synoptic IP conducts freedom to operate searches 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. 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 controls 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 the attorney 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 an identified patent, or whether it is valid, 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. In the US, a reasoned opinion can still help to show good faith.