PCT minimum documentation: what changed in 2026

What actually changed on 1 January 2026?

Amendments to the PCT Regulations entered into force on 1 January 2026, and among them are revisions to Rules 34, 36 and 63 containing a new definition of the PCT minimum documentation that an International Searching Authority must consult during international search.

That sentence is short, but the minimum documentation is the floor beneath every international search report and every written opinion built on one. Redefining it changes what an Authority is obliged to look at before it tells you your claims are novel. Two further changes travel with it. The amendments to Rules 33 and 64 extend the definition of relevant prior art, for both international search and international preliminary examination, to cover non-written disclosures. And the revisions to Rules 34, 36 and 63 also alter the minimum requirements that an International Searching Authority and an International Preliminary Examining Authority must satisfy before appointment and throughout their term — so the quality obligation attaches to the institution, not only to the individual search.

Which collections joined the minimum documentation?

Twenty national patent collections were added as of 1 January 2026, including Ukraine’s patent documentation, Poland’s and Brazil’s, and the minimum documentation now also includes all utility model documents supplied by offices.

The utility model point deserves separate attention from the headline count. Utility models are, in many systems, the cheaper and faster protection route, filed in volume, and often the place where a local competitor’s incremental engineering work is recorded rather than in a patent family with international reach. Bringing all office-supplied utility model documents inside the minimum documentation means an Authority’s obligatory reading list now extends into a body of technical disclosure that international search practice has historically touched unevenly.

Why does the Ukrainian addition matter beyond the arithmetic?

Because a collection that was previously outside the mandatory scope of international search is now inside it, and the practical exposure of any given portfolio to that change depends on where its competitors have been filing.

If your organisation, or the companies you monitor, has been filing in Ukraine — directly, or through acquisitions, joint ventures or contract manufacturing relationships that generated local filings — then the documents produced by those filings have moved from a category an International Searching Authority might have consulted to one it must consult. The same logic runs through Poland, Brazil and the rest of the twenty. For in-house counsel the useful exercise is not to memorise the list but to map it against the jurisdictions where your sector’s actual competitive filing activity sits, and to identify which of those jurisdictions were previously absent from the search floor your existing opinions were built on.

One practical comfort: most of the newly added patent collections are already accessible through the PATENTSCOPE database, so the material is not, for the most part, locked away in offices that only Authorities can reach. Your own searchers and your external providers can go and look.

What does the extension to non-written disclosures change?

It widens what counts as relevant prior art for international search and international preliminary examination beyond documents, which is a conceptual change of a different order from adding collections.

Adding twenty collections makes the obligatory corpus bigger but keeps it the same kind of thing: patent and utility model documents, findable by number, classification and text. Extending prior art to non-written disclosures moves the enquiry into material that is not, by definition, sitting in a database waiting to be indexed. For those advising on validity, the immediate consequence is that the set of things that could in principle be cited against a claim in the international phase has grown, and grown in a direction that is harder to search exhaustively in advance.

Where do you now look up what is in scope?

WIPO’s International Bureau has published an updated list of patent and utility model documentation in a digital-first format as Part 4.1 of the WIPO Handbook, presented as a dynamic table with search and sort functionality.

This is a small administrative point with real operational value. A search-and-sort table is something you can hand to a provider, or attach to an internal search protocol, as the authoritative statement of what the minimum documentation contains. Where a search brief previously said “the PCT minimum documentation” and left the content of that phrase to the provider’s assumptions, it can now point to a maintained reference that both sides can check. If your organisation keeps written search standard operating procedures, Part 4.1 is the citation that belongs in them.

One further infrastructure change sits behind the rule amendments: PCT international searching authorities and the national offices of member states have begun exchanging full-text patent applications, replacing the image-only formats still used in some cases. Full text rather than images is the difference between a document that can be searched and analysed and one that can only be looked at.

What does this development not settle?

It changes what an International Searching Authority must consult; it does not change the substantive novelty standard in any national or regional law, and it does not reach backwards.

The distinction matters when clients ask whether their patents have become weaker. The novelty and inventive step tests applied by national and regional offices and courts are set by their own statutes, and nothing in the PCT Regulations rewrites them. What has changed is the input: the material an Authority is obliged to place in front of itself before reporting. Nor do the amendments retroactively affect search reports already issued. A report dated before 1 January 2026 was produced against the minimum documentation then in force, and it remains exactly what it was — which is why it may now be an incomplete basis for a current validity assumption rather than a wrong one.

Several further questions are simply outside the scope of what the amendments address. They say nothing about how deeply or how quickly the newly added collections are indexed, translated or made machine-searchable; accessibility through PATENTSCOPE is not the same as depth of indexing or availability in a working language. They do not alter Ukraine’s own filing routes, and they do not govern the search practice of the EPO or any other office outside the PCT framework. And the extension of the prior-art definition to non-written disclosures leaves open how examiners will evidence and date such disclosures — a question that will be answered in practice, case by case, rather than by the rule text. Treat all of these as open items to be watched, not as gaps you can fill with assumptions in an opinion.

What should you do now?

Re-specify your search briefs, budget for the citations you are about to receive, and revisit the validity assumptions that rest on searches conducted before 1 January 2026.

Start with the briefs. Prior-art and freedom-to-operate instructions to external providers should state expressly that the newly added collections are within scope, and should cover utility model documents rather than patents alone. Where your portfolio has exposure in Ukraine, Poland, Brazil or any other newly added jurisdiction, name those jurisdictions in the brief instead of relying on a generic reference to the minimum documentation. Point to Part 4.1 of the WIPO Handbook as the reference list, and ask providers to confirm which of the added collections their tooling actually reaches.

Then the budget. Expect international search reports to carry more citations, and citations from collections your team has not read before. Some of those documents will need translation before anyone can assess relevance, and translation plus substantive analysis of unfamiliar national documents is slower and more expensive per citation than dealing with a familiar EP or US reference. Build that into search and prosecution cost estimates for the year rather than absorbing it as an overrun.

Finally, the back file. For pending families where the underlying search predates 1 January 2026, identify those where a competitor’s filing in a newly covered jurisdiction could plausibly exist, and decide deliberately whether a supplementary search is warranted before you rely on the earlier opinion for a licensing, litigation or acquisition decision. The earlier report is not wrong; it was simply produced against a narrower floor, and the difference between those two statements is where the risk now sits.