FTO vs Patentability Search: Which Search Do You Need?

Why the Distinction Matters

The three searches are often confused because they draw on the same databases. They answer different questions, however, and a search built for one purpose rarely answers another. A strong patentability result says nothing about infringement risk: an inventor can obtain a valid patent on an improvement and still infringe a broader earlier patent by practicing it.

Patentability Search

A patentability search, sometimes called a novelty search, tests an invention against the prior art. Because anything made public before the effective filing date can defeat novelty or support obviousness, the search covers patents and published applications from every jurisdiction, non-patent literature, standards documents, and product information, in any language.

The search reads documents for what they disclose, not for what they claim. A single reference that describes every element of the invention supports a § 102 rejection; references that together suggest the invention may support a § 103 rejection.

Run a patentability search after an invention disclosure is received and before significant drafting cost is incurred. The results help decide whether to file, how broadly to claim, and which references to cite in an information disclosure statement.

Freedom-to-Operate Search

A freedom-to-operate search, also called a clearance search, looks at the product rather than the invention. It asks whether making, using, selling, or importing the product would infringe someone else's enforceable rights.

That changes the scope in three ways:

• Claims, not disclosures: Only the claims define infringement, so the analysis compares each claim element against the product. A patent that describes the product in its specification but claims something else is not a risk.
• Territory: Patents are territorial, so the search is limited to countries where the product will be manufactured, used, sold, or imported.
• Status: Expired and abandoned patents are generally excluded, but pending applications are included, because their claims may issue in a form that reads on the product.

The deliverable is a risk assessment. For high-stakes launches, counsel often prepares a formal opinion on non-infringement or invalidity of the most relevant patents. FTO work is refreshed as the design changes and as new patents issue, and it is a standard part of IP due diligence before an acquisition.

Invalidity Search

An invalidity search targets one patent. The searcher identifies the patent's priority date and the elements of its asserted claims, then looks for earlier references that anticipate or render those claims obvious. The scope is as broad as a patentability search, and searchers often look harder at non-patent literature and product documentation, because the examiner has already reviewed the most obvious patent art.

Invalidity searches support responses to demand letters, defenses in litigation, and petitions for inter partes review, which are limited to patents and printed publications. The usual deliverable is a ranked list of references with claim charts mapping each claim element to the art.

How the Searches Connect

The three searches often feed one another. An FTO search may surface a blocking patent, which prompts an invalidity search against it. A patentability search may reveal a crowded field, which signals that FTO risk is worth assessing before launch. Treating each as a distinct project with its own question, scope, and budget keeps the results reliable.

Practical Considerations

• Define the question first. State whether the goal is to file, to launch, or to challenge before any search begins.
• Describe the right thing. Patentability searches describe the invention; FTO searches describe the product as it will actually ship.
• Record the cutoff. Note the search date and databases used, since new publications and issued patents appear continuously.
• Involve counsel appropriately. FTO and invalidity conclusions often need to be privileged, so route them through counsel.

A continuously updated view of the relevant art makes each of these searches faster to start, and ArcPrime's freedom-to-operate tools compare product features against in-force claims in the jurisdictions a team selects.