A PCT application is a single international patent filing, made under the Patent Cooperation Treaty (PCT) and administered by the World Intellectual Property Organization (WIPO), that preserves an applicant’s right to seek patent protection in any of the treaty’s 158 Contracting States without having to file a separate application in each one up front. It is a filing and search mechanism, not a grant mechanism — there is no such thing as a single “PCT patent” or “international patent” that issues at the end of the process. This guide covers what the PCT route actually does, its timeline from priority date through national phase entry, how it fits around a U.S. provisional filing, and why a university technology transfer office (TTO) typically chooses it over filing directly in each target country. For the underlying U.S. filing types this guide assumes, see CASRAI’s provisional patent application guide and cost of filing a patent guide — this page does not re-derive USPTO-specific requirements or fee schedules already covered there.
What the PCT Actually Does — and Doesn’t Do
Filing one international application under the PCT has, as of its filing date, the same legal effect in every PCT Contracting State as if separate national or regional applications had been filed in each of them that same day. That is the entire mechanical benefit: it buys time and defers a decision, it does not shortcut examination. Per WIPO’s own description of the system, the PCT “establishes a cost-effective means for companies and innovators to seek patent protection for inventions in multiple countries” by consolidating the earliest, most duplicative steps — a single filing, a single prior-art search, a single (optional) preliminary examination — into one international phase, before the applicant has to commit to the cost of prosecuting in each country individually.
What it does not do: it does not result in a granted patent anywhere. Substantive examination and grant remain entirely the responsibility of each national or regional patent office (the USPTO, the European Patent Office, the China National Intellectual Property Administration, and so on) once the application enters that office’s national phase (or, for a regional system like the EPO, the regional phase). A PCT application that never enters any national phase never becomes a patent anywhere — it simply lapses after the international phase ends.
The PCT Timeline, Step by Step
Every PCT timeline runs from a single anchor date: the priority date, the filing date of the first application (anywhere) for the same invention. The stages that follow are defined in fixed relation to that date, not to when the PCT application itself is filed.
Priority filing and the 12-month window
Most applicants file a national or regional patent application first — for a U.S. applicant, this is usually a USPTO provisional application, though a non-provisional works too — and then have up to 12 months from that filing date, under the Paris Convention priority right, to file a PCT application claiming priority back to it. Filing the PCT application within this window means the international application is treated, for novelty and prior-art purposes in every country it later enters, as if it had been filed on the original priority date, not the later PCT filing date. It is also possible to file a PCT application as the very first filing, with no separate priority application, though that is less common for a first-time inventor still assessing patentability.
The international phase: search, written opinion, publication
Once filed, the application enters the PCT’s international phase, run by an International Searching Authority (ISA) — a national or regional patent office authorized to act in that role (the USPTO, EPO, and several others all serve as ISAs, and an applicant’s choice of ISA depends on which offices are available to their Receiving Office). The ISA produces two things: an international search report listing the closest prior art it found, and a written opinion on patentability assessing novelty, inventive step, and industrial applicability against that art — a non-binding but substantive early read on whether the invention is likely to be patentable, months before any national office examines it. International publication follows, as soon as possible after 18 months from the priority date, making the application (and the search report) publicly available.
Optional Chapter II: international preliminary examination
If the applicant disagrees with the written opinion or wants to amend claims and get a second, more considered assessment, they can file a “demand” for international preliminary examination under PCT Chapter II (Article 31), handled by an International Preliminary Examining Authority (IPEA, typically the same office that acted as ISA). This produces an International Preliminary Report on Patentability (IPRP Chapter II) in place of the Chapter I report derived from the original written opinion. This step is optional and adds cost; most applicants who are already leaning toward proceeding to national phase skip it and rely on the Chapter I written opinion alone.
National (or regional) phase entry: 30 or 31 months
The international phase ends, and the applicant must decide, country by country, whether to proceed into the national or regional phase in each state where they still want protection. WIPO’s own PCT guidance sets the default deadline at the 30th month from the priority date for the majority of Contracting States’ offices. A number of major offices — including the European Patent Office, South Korea’s KIPO, Australia’s IP Australia, and Japan’s JPO — extend this to 31 months by their own national law; the USPTO does not grant a routine extension beyond 30 months. Because the exact figure is set office by office, always confirm the current deadline in the WIPO PCT Applicant’s Guide or directly with each target office before relying on 30 versus 31 months for a specific country. Missing this deadline in a given country generally means losing the right to obtain a patent there through that PCT application, subject to narrow, office-specific reinstatement provisions that should not be relied on as a fallback plan.
Put together, the timeline gives an applicant roughly 18 months longer to make a country-by-country commercialization and cost decision than the bare 12-month Paris Convention window alone would allow — 12 months to file the PCT application, plus up to another 18-19 months of international phase before national phase fees and local counsel become due anywhere.
How the PCT Fits a U.S. Provisional-to-National-Phase Pattern
For a U.S. research institution, the PCT route most often shows up as the middle step in a three-stage sequence:
- File a U.S. provisional application to establish an early priority date cheaply and quickly, typically right after an invention disclosure while patentability and commercial interest are still being assessed. See CASRAI’s provisional patent application guide for USPTO requirements and the 12-month provisional-to-non-provisional deadline, and the worked example for what that process looks like end to end.
- File a PCT application within 12 months of the provisional, claiming priority back to it. This is frequently done alongside — not instead of — filing a U.S. non-provisional application at the same 12-month deadline: many applicants file both a U.S. non-provisional and a PCT application claiming the same priority, so U.S. prosecution proceeds on its own track while the PCT application keeps the door open everywhere else.
- Enter national phase in specific target countries by 30 or 31 months from the original provisional’s priority date — at which point separate national fees, often a local patent agent, and frequently a translation become due in each country chosen.
A provisional filing alone only ever leads to a U.S. non-provisional application; it has no independent effect outside the United States. The PCT step is what actually preserves the option of foreign protection, and doing it within the same 12-month Paris Convention window that governs the U.S. non-provisional deadline is why the two are so often handled together rather than as separate decisions.
Why a Technology Transfer Office Uses the PCT Route
Filing separate national applications in a dozen countries at the 12-month priority deadline means committing to a dozen sets of government fees, a dozen local patent agents, and often a dozen translations — all before an institution has any external signal (a licensee, a term sheet, a startup pitch that closed) about which countries the resulting license or product will actually need protection in. For a university TTO managing a large, technically diverse invention portfolio under Bayh-Dole (35 U.S.C. §§ 200–212) and finite patent budget, that is the wrong point in the process to commit that much money.
The PCT route defers the expensive part of the decision without giving up the underlying rights:
- One filing preserves optionality everywhere. A single PCT application keeps the door open in all 158 Contracting States simultaneously, rather than forcing an immediate country-by-country choice at 12 months.
- The international search report and written opinion arrive before the expensive decision does. A TTO gets a substantive, examiner-quality read on patentability well before the 30/31-month national phase deadline — useful diligence when deciding whether an invention is worth the cost of pursuing broadly, narrowing to fewer countries, or abandoning.
- The extra ~18 months lines up with licensing timelines. Identifying a licensee, negotiating a license agreement (see CASRAI’s patent licensing guide), or determining that a faculty-founded startup will commercialize the technology often takes longer than 12 months. The PCT window gives that process time to produce real evidence — a licensee’s specific target markets, for instance — before national phase filing decisions have to be locked in.
- National phase fees can then be limited to the countries that matter. Instead of guessing at 12 months, the TTO (often informed by a licensee who is willing to share or reimburse the cost) selects national phase countries at 30/31 months based on where the actual commercial opportunity is.
What a PCT Application Costs
PCT filing fees are separate from, and in addition to, the national phase fees each target country later charges. As of the current USPTO fee schedule, filing a PCT application with the USPTO acting as Receiving Office involves three main components: a transmittal fee ($285 for a large entity, $114 small entity, $57 micro entity), an international search fee when the USPTO acts as International Searching Authority ($2,400 / $960 / $480), and an international filing fee paid to WIPO’s International Bureau ($1,667 for the first 30 pages of the application, plus $19 per page after that) — this last fee is set in Swiss francs by WIPO and is not reduced by U.S. small- or micro-entity status the way the USPTO’s own fees are. For the full breakdown of these figures alongside provisional and non-provisional USPTO fees, and what national phase entry typically adds per country, see CASRAI’s cost of filing a patent guide, which covers the PCT cost components in more depth as part of a complete patent-cost picture. National phase entry itself then adds a further, separate cost per country — a national filing fee, frequently a required translation of the full application, and typically a local patent agent, none of which is included in the international-phase fees above.
Who Files, and Where
A PCT application is filed with a Receiving Office — usually the applicant’s own national or regional patent office (a U.S. applicant typically files with the USPTO acting in that capacity), or, in many cases, directly with WIPO’s International Bureau in Geneva. The Receiving Office performs a formalities check and forwards the application to the chosen International Searching Authority. Which offices are available to act as ISA (and later IPEA) depends on the applicant’s Receiving Office and nationality/residence — U.S. applicants filing through the USPTO can typically choose among the USPTO itself and several other participating offices, each with different fees and search-quality reputations by technology area, which is why patent counsel usually makes this selection rather than the inventor or TTO staff directly.
What Happens at National Phase Entry
Entering the national phase in a given country converts the international application into a regular national (or regional) application in that office, subject to that office’s own substantive examination going forward — the international search report and written opinion inform, but do not bind, the national examiner. Typical national phase entry requirements include: a national filing fee, a certified or applicant-prepared translation into the local official language if the PCT application wasn’t already filed in it, appointment of a local patent agent or attorney (most countries require local representation), and, in some offices, a request for examination filed separately from entry itself. Missing the 30- or 31-month deadline in a given country, without qualifying for that office’s specific late-entry or reinstatement provisions, generally forecloses obtaining a patent there through that application.
Frequently Asked Questions
What does PCT stand for?
Patent Cooperation Treaty — a 1970 treaty, administered by WIPO, that governs the international-phase filing and search procedure described throughout this guide. It is a procedural treaty, not a separate body of substantive patent law; substantive patentability requirements are still set by each country’s own patent statute.
Does filing a PCT application get you a patent?
No. A PCT application never itself results in a granted patent, in any country. It preserves the right to pursue a patent in any PCT Contracting State by entering that country’s national or regional phase, where that office’s own examiners decide whether to grant.
How much does a PCT application cost?
The international-phase fees (transmittal, search, and international filing fees) typically run in the low thousands of U.S. dollars before attorney fees, separate from whatever each target country later charges at national phase entry. See CASRAI’s cost of filing a patent guide for the current fee figures and how they combine with USPTO domestic costs.
Is the national phase deadline 30 months or 31 months?
It depends on the specific country. WIPO’s default rule sets 30 months from the priority date for most Contracting States’ offices; a number of major offices, including the EPO, extend this to 31 months under their own national law. The USPTO does not extend beyond 30 months. Always confirm the current deadline for each target country directly before relying on either figure.
Can I file a PCT application without filing a U.S. provisional first?
Yes. A PCT application can itself be the first-ever filing for an invention, with no separate priority application. In practice, many U.S. applicants file a provisional first because it is quicker and cheaper, then use the PCT application (filed within 12 months) to claim priority back to it while preserving foreign rights — but the provisional step is not a legal prerequisite to filing a PCT application.
What happens if I miss the national phase deadline in a country?
In most countries, missing the 30- or 31-month national phase entry deadline without qualifying for that office’s specific reinstatement or excuse-of-delay provisions means losing the right to obtain a patent there through that PCT application. Reinstatement provisions vary widely by country and generally require showing the delay was unintentional or due to circumstances beyond the applicant’s control — they should not be treated as a routine safety net.
For the broader technology transfer and licensing context this guide sits within, see CASRAI’s Technology Transfer & Innovation pillar page.
