International Patent Protection: Navigating the PCT Route

For growing innovative businesses, expanding into international markets is an exciting development which invites intellectual property considerations. Securing patent protection across multiple jurisdictions is vital to safeguard a competitive edge, but attempting to file individual patent applications in every target country at the same time can quickly overwhelm working capital and administrative resources.

This is where the Patent Cooperation Treaty (PCT) becomes one of the most powerful tools within a company’s IP strategy. Here we break down what a PCT patent application is, how the process works, and why making use of this framework can give your business a commercial advantage.

What is a PCT application?

A common misconception is that a PCT application results in a single, overarching “international patent” that automatically protects an invention worldwide. In reality, no single application can grant global patent rights. Patent rights remain strictly territorial and must ultimately be granted by national or regional patent offices (such as the UK Intellectual Property Office, the European Patent Office, or the US Patent and Trademark Office).

Instead, the Patent Cooperation Treaty – administered by the World Intellectual Property Organization (WIPO) – is a single procedure for filing a patent application which can ultimately be applied to any of its 150+ contracting states. Filing a Patent Cooperation Treaty application acts as a unified “placeholder.” By submitting one international application in a single language at one ‘receiving Office’, you can effectively preserve a filing date across more than 150 countries at once at a significantly reduced cost.

Almost all major economies are contracting states of the PCT. For territories which are not PCT contracting states (such as Taiwan and Argentina), patent protection can only be achieved under the Paris Convention by filing national applications and paying the requisite fees within 12 months of a domestic priority application.

How does the Patent Cooperation Treaty process work?

The PCT application process is divided into two distinct phases: the International Phase and the National (or Regional) Phase.

Phase 1: The International Phase

The International Phase begins with filing a PCT application, typically within 12 months of filing a domestic priority application. The International Phase comprises four main stages:

• Filing (‘Chapter I’): Submit a single Patent Cooperation Treaty application in one language at an eligible receiving Office (such as the European Patent Office), paying a single set of initial fees.
• International search & written opinion: An International Searching Authority (ISA), such as the European Patent Office, conducts a comprehensive prior art search to assess whether the invention is novel and involves an inventive step. An International Search Report (ISR) is issued, listing the prior art documents that the ISA considers relevant, along with a non-binding preliminary written opinion on patentability (the ‘WO-ISA’).
• International publication: Shortly after 18 months from the initial priority application filing, WIPO publishes the PCT application, making the technical details of the invention public.
• Optional preliminary examination (‘Chapter II’): An optional examination stage can be requested, providing an opportunity to address any negative findings in the WO-ISA and receive an updated written opinion before entering the National Phase.

Phase 2: National (or Regional) Phase

At 30 or 31 months from the initial priority date (depending on the target jurisdiction), the application transitions into the National Phase. At this point, you decide which countries or regions you wish to pursue patent protection in and pay the requisite national entry fees. Your application is then evaluated by each selected national or regional patent office under their respective patent laws.

Why should you consider using the PCT route?

Choosing the PCT patent application path offers several commercial and strategic benefits for growing companies, venture-backed startups, and multinational enterprises.

It can give you financial breathing room

Without the PCT, a business wishing to protect an invention internationally under the Paris Convention must file all individual national applications within 12 months of the initial priority filing. This requires paying substantial foreign filing fees, official search fees, and local attorney representation fees in multiple countries all at once.

The PCT extends this window from 12 months to 30 or 31 months. This extra 18+ months allows your business to:

• Evaluate commercial traction and market potential in key territories.
• Secure investment or licensing partners to fund foreign IP filing costs.
• Refine the commercial implementation of the product before committing significant capital.

You’ll receive an early risk assessment

Receiving the International Search Report (ISR) and Written Opinion (WO-ISA) during the PCT International Phase provides an early, high-quality assessment of the patentability of your invention. The ISR and WO-ISA is often later taken into account by national and regional patent offices during examination. If the ISR and WO-ISA identifies relevant prior art, this provides an opportunity to adapt strategy, modify claims, or decide not to proceed into costly national filings at all, potentially saving significant sums in foreign prosecution costs.

You can build investor confidence

A pending PCT patent application can be attractive to prospective investors, licensees, and commercial partners during early-stage negotiations, by showing that your IP assets are in the process of being secured internationally. A pending PCT application also allows you to mark your products or marketing materials as “Patent Pending” across PCT contracting states in the same way as a national patent application.

What PCT patent fees are involved in the process?

Budgeting for international patent protection requires understanding how PCT patent fees are structured across the timeline.

While filing a PCT application adds an initial layer of administrative fees, it defers the significantly larger expenses associated with national filings (such as translation costs and foreign attorney fees). An illustration of the administrative fees is set out below.

Maximise your international IP strategy

If you are planning to launch an innovative product or technology in international markets, early strategic planning is critical. Contact us today to discuss how choosing the Patent Cooperation Treaty route can support your global business objectives.