PCT International Patent Application: How to Protect an Invention Worldwide

A single invention rarely needs protection in just one country, yet filing a separate patent application in every market is slow and expensive. A PCT international patent application solves the first part of that problem: one filing, made through the World Intellectual Property Organization (WIPO), that reserves your right to seek a patent in more than 150 countries from a single starting point. It does not hand you a worldwide patent, because no such thing exists. This guide explains what the route is, how the PCT system works, what it costs, and how to file from Turkey through the Turkish Patent and Trademark Office (TÜRKPATENT).

What Is a PCT International Patent Application?

A PCT international patent application is a single international filing, governed by the Patent Cooperation Treaty, that lets an inventor seek patent protection in many countries through one centralised procedure. The treaty was concluded in 1970 and is administered by WIPO. As of the time this article is written, it has more than 150 contracting states, including Türkiye, the member states of the European Union, the United States, China, Japan and most major economies.

The key point is what the system does not do. A PCT filing does not create a single global patent that is valid everywhere, because no such instrument exists. Instead, the Patent Cooperation Treaty application gives you a unified filing and examination procedure, plus a long window in which to decide where you actually want patents.

The decision to grant a patent always stays with each national or regional office, which examines the invention under its own law. What you gain is time, a strong early search, and one streamlined process instead of dozens of simultaneous national filings.

How Does the PCT System Work?

The PCT system works in two stages: an international phase managed centrally by WIPO, then a national phase in each country where you decide to pursue protection. The early choices shape the cost and timing of everything that follows, so it pays to understand the sequence before you file.

The international phase generally runs like this:

1. Filing. You file one international application, in one language, with a receiving office. For an applicant connected to Türkiye, that office is TÜRKPATENT.
2. International search. An International Searching Authority reviews the prior art and issues an international search report with a written opinion on whether the invention looks new and inventive.
3. International publication. WIPO publishes the application, usually around 18 months from the priority date, in its PATENTSCOPE database.
4. Optional preliminary examination. You may request an international preliminary examination for a fuller, non-binding opinion on patentability before you commit to national filings.

People often ask how does the PCT system work for one invention across many markets, and the honest answer is that it organises the front end of the process. It does not replace national grant. It postpones and informs it.

The written opinion is the part to watch, because it gives you an early read on your chances before you spend money entering individual countries.

The Two Phases: International and National

Every PCT route has the same shape: a single international phase, then a separate national phase in each chosen country. The international phase buys you information and time. The national phase is where patents are actually granted or refused.

The International Phase

During the international phase, your application is searched, published and, if you ask for it, examined on a preliminary basis. Nothing is granted here. The output is a set of documents, the international search report and written opinion, that tell you how strong your position is. Many applicants use this phase purely to decide whether the invention is worth the larger investment of national filings.

The National Phase

In the national phase, you enter the individual countries and each office takes over. From this point, the process is no longer centralised. Each office charges its own fees, may require a translation, examines under its own patent law, and grants or refuses protection on its own territory. A local representative is usually required here, because national procedures differ from country to country.

PCT National Phase Entry and the 30-Month Deadline

PCT national phase entry is the step where your single international application splits into separate national applications in the countries you choose. The deadline is the feature that makes the whole system worthwhile: in most countries you have until 30 months from the priority date to enter the national phase, and some offices allow 31 months or more.

That window is the real advantage of the PCT route. Compared with the 12-month Paris Convention deadline for filing directly abroad, PCT national phase entry gives you an extra year and a half to assess the market, raise funding, refine the product and read your international search report before paying national fees. You only spend money entering the countries that still make commercial sense at the 30-month mark. If a market no longer matters, you simply do not enter it.

Missing the PCT national phase entry deadline is serious, because reinstatement is difficult and decided country by country. Diary the priority date carefully, and plan national filings well before the limit rather than at the last moment.

Who Can File a PCT International Patent Application?

You can file a PCT international patent application if you are a national or resident of a PCT contracting state. A business or individual connected to Türkiye qualifies, and TÜRKPATENT acts as the receiving office for that filing.

The usual starting point is a first national filing. Most applicants file a patent application at home first, then file the international application within 12 months to claim priority from that first filing under the Paris Convention. You can also take the PCT route as your very first application. Either way, the priority date you establish governs every later deadline, including international publication and the 30-month national phase limit, so getting that first date right is fundamental.

How to File a PCT Application From Turkey, Step by Step

Filing a PCT application from Turkey runs through TÜRKPATENT as the receiving office, under Türkiye’s Industrial Property Code No. 6769 for the home patent and the Patent Cooperation Treaty for the international stage. Most of the work happens before anything reaches WIPO, and careful preparation is what keeps the later national phase manageable.

1. Secure your priority filing. File a Turkish patent or utility model application first, or prepare to take the PCT route as your first application, and fix your priority date.
2. Run a prior-art search. Check existing patents and publications so you understand your real chances before investing in the international route.
3. Prepare the international application. Draft clear claims, a full description and any drawings, and choose a filing language the receiving office accepts.
4. File through TÜRKPATENT. Submit the application to the receiving office, which checks formalities and transmits it to WIPO and the International Searching Authority.
5. Review the search report. Read the international search report and written opinion, and decide whether to request international preliminary examination.
6. Plan national phase entry. Before the 30-month deadline, choose your countries and prepare PCT national phase entry, including any translations and local representatives.

When you are filing a PCT application from Turkey, the EPO commonly acts as the International Searching Authority for applications routed through TÜRKPATENT, which means the search you receive carries real weight in later European proceedings. In our practice before TÜRKPATENT, applicants who invest in a clean priority filing and a thorough prior-art search tend to face fewer surprises once the national phase begins.

Costs and Timeline of a PCT International Patent Application

The cost of a PCT international patent application falls into two buckets: the international phase fees and, later, the national phase fees in each country you enter. As of the time this article is written, the international phase involves a WIPO international filing fee, a search fee set by the chosen International Searching Authority, and a transmittal fee charged by the receiving office. These are paid largely in Swiss francs.

The larger spend usually comes at PCT national phase entry, where each country charges its own filing and examination fees, often alongside translation and local representation costs. Because official fees are revised periodically, treat any figure as indicative and confirm the current schedule on the WIPO website (wipo.int) or with a patent attorney before you file.

On timing, plan for the long view. International publication usually occurs around 18 months from the priority date, and national phase entry is due at 30 months in most countries. Each national office then runs its own examination, which can take several more years before a patent is granted or refused. Filing a PCT application from Turkey is quick at the front end, but full protection across your chosen markets is a multi-year process.

PCT Versus Direct National Filings

Whether the PCT route or direct national filing suits you depends on how many countries you need and how settled your plans are. The main trade-offs come down to a few points.

• Initial filings. The PCT route needs one international application; direct filing needs a separate application in each country.
• Decision deadline. The PCT route gives you up to 30 or 31 months from priority to choose markets; direct filing holds you to the 12-month Paris Convention limit.
• Early search. The PCT route delivers one central international search and written opinion; with direct filing each office searches separately.
• Best fit. The PCT route suits several markets, or plans that are still forming; direct filing suits one or two known markets.
• Non-member countries. The PCT route cannot reach the handful of states outside the treaty, so for those you must file directly.

For one or two known markets, direct national filing can be the cleaner and cheaper choice, and it is the only route for the few countries that are not PCT members. For a broader rollout, or when your commercial plans are still forming, the PCT route’s extra time and central search usually make it the more efficient path to international patent protection.

Frequently Asked Questions

What is a PCT international patent application?

A PCT international patent application is a single international filing under the Patent Cooperation Treaty that lets you seek patent protection in more than 150 countries through one centralised procedure managed by WIPO. It does not grant a worldwide patent; each country still examines and grants the patent under its own law.

How does the PCT system work?

The PCT system works in two stages. First an international phase, where WIPO handles filing, an international search and publication, then a national phase where you enter individual countries and each office examines the invention and decides whether to grant a patent.

Does a PCT application grant a worldwide patent?

No. There is no such thing as a single worldwide patent. A PCT international patent application gives you a unified filing procedure and time to choose markets, but every patent is still granted, refused, renewed and enforced country by country under national law.

What is the PCT national phase entry deadline?

PCT national phase entry is generally due 30 months from the priority date, and some offices allow 31 months. This deadline is the main advantage of the route, giving you far more time than the 12-month Paris Convention limit to decide where to pursue protection.

Can I file a PCT application from Turkey?

Yes. You file the PCT application from Turkey through TÜRKPATENT as the receiving office, usually based on or alongside a Turkish patent application. Non-resident applicants must act through a registered Turkish patent attorney.

How much does a PCT international patent application cost?

The cost depends on how many countries you eventually enter. The international phase carries WIPO filing, search and transmittal fees in Swiss francs, while the larger spend comes at national phase entry through each country’s own fees, translations and local representation. Confirm current figures on wipo.int or with a patent attorney before filing.

How long does the PCT process take?

The PCT process is fast at the start but long overall. International publication usually occurs around 18 months from priority and national phase entry is due at 30 months, after which each national office runs its own examination, which can add several more years before a patent is granted.

Protecting an Invention Abroad: A Final Word

A PCT international patent application turns the daunting task of seeking patents in many countries into one organised filing, backed by a central search and a generous window to decide where protection is worth pursuing. Fix a solid priority date, read your international search report carefully, and plan PCT national phase entry well before the 30-month deadline, and you keep control of both cost and strategy.

The Patent Cooperation Treaty application is one of the most useful tools for taking an invention global, but the foundation has to be sound. If you are considering filing a PCT application from Turkey, or weighing the PCT route against direct national filings, getting professional input before you file is the safest path. Contact us for more information.

About Leo Patent

Leo Patent is a leading trademark and patent attorney firm (marka ve patent vekili) serving foreign and Turkish clients across Türkiye. The firm is registered before the Turkish Patent and Trademark Office (TÜRKPATENT) and the Istanbul Chamber of Commerce (registration no. 308755-5), and handles trademark, patent, design and other intellectual property registrations in Türkiye and internationally.

This article was prepared under the supervision of Burak Ünal, general manager of Leo Patent, registered trademark attorney (TÜRKPATENT reg. no. 2900) and registered patent attorney (TÜRKPATENT reg. no. 1677). He holds a Business Management degree from Boğaziçi University (2016) and an MSc in Finance from the London School of Economics, which he attended as a Chevening Scholar; he is also a congress member of Galatasaray Sports Club. He advises clients in Turkish, English, French and Chinese. In Türkiye, trademark and patent attorneys are a regulated profession separate from lawyers: Burak Ünal is not a lawyer, and Leo Patent does not provide lawyer services or court representation.

Need help with a trademark or patent in Türkiye? Contact Leo Patent for a consultation: www.leopatent.com · [email protected] · WhatsApp +90 532 689 48 18.

Disclaimer: Leo Patent is a trademark and patent attorney firm (marka ve patent vekili) and is not a law firm; it does not provide lawyer services, legal advice or court representation. This article is for general informational purposes only and you are strongly advised to consult a qualified professional to evaluate your personal situation. No liability is accepted that may arise from the use of the information in this article.