The Patent Cooperation Treaty (PCT) and Its Origins

The Patent Cooperation Treaty (PCT) was signed in Washington, D.C., on 19 June 1970 and entered into force on 24 January 1978. Administered by the World Intellectual Property Organization (WIPO), it created a single international patent application that preserves your right to file in over 155 member countries — a revolution in how inventors protect ideas globally.

Key Takeaways

• The PCT was signed on 19 June 1970 and became operational on 1 June 1978, with WIPO as its administering body.
• It is not a "world patent" — it streamlines the early filing and search phase but grants are handled separately by each national or regional patent office.
• A single PCT application preserves your priority date across 155+ member states, giving you up to 30 months to decide where to pursue full patents.
• Nepal is not a PCT member — Nepali inventors and foreign applicants must file directly with the Department of Industry (DoI) through a local agent.
• The treaty's roots trace back to the 1883 Paris Convention, whose union of member countries drove the push for a unified filing system.
• For patent protection in Nepal, the governing law remains the Patent, Design and Trademark Act 1965 (PDTA), with patents valid for 7 years, renewable.

What is the Patent Cooperation Treaty?

The Patent Cooperation Treaty is an international patent law treaty signed in Washington, D.C., on 19 June 1970. It provides a unified procedure for filing a single international patent application to protect an invention in each of its 155-plus contracting states. The PCT does not grant a "world patent" — no such thing exists — but it gives you a single priority date, a centralised international search, and up to 30 months before you must commit to expensive national-phase filings in each country you choose.

Why was the PCT created?

Before 1970, an inventor who wanted patent protection in five countries had to file five separate applications, in five languages, pay five sets of fees, and run five parallel examinations — all within the 12-month Paris Convention priority window. The administrative burden was enormous. The WIPO predecessor, BIRPI, began drafting the treaty in 1966, and the Diplomatic Conference in Washington adopted the final text on 19 June 1970, with 18 countries signing immediately. The treaty entered into force on 24 January 1978, and the first PCT application was filed on 1 June that same year.

Who administers the PCT?

The World Intellectual Property Organization (WIPO), headquartered in Geneva, administers the PCT system. WIPO coordinates the international phase — receiving applications, arranging the international search by an approved International Searching Authority (ISA), and publishing the application. After the international phase, each national or regional patent office you designate takes over for its own examination and grant decision under its own domestic law.

How does the PCT system work?

1. File one international application. You submit a single PCT application, in one language, to your national receiving office or directly to WIPO.
2. International search. An ISA — such as the European Patent Office, the USPTO, or the Indian Patent Office — conducts a prior-art search and issues a written opinion on patentability.
3. International publication. WIPO publishes your application 18 months from the priority date, making the invention publicly known.
4. Optional international preliminary examination. You can request a more detailed patentability analysis before entering the national phase.
5. National phase. Within 30 months of the priority date (31 in some offices), you enter the national phase in each country where you want a patent, paying local fees and engaging local agents.

Each designated office then examines and grants the patent under its own laws — the PCT never issues a patent itself.

What are the key dates in patent cooperation treaty history?

Is Nepal a member of the PCT?

Nepal is not a contracting state to the Patent Cooperation Treaty. It has not acceded to the PCT, nor is it a member of the Madrid System for trademarks. For patent protection in Nepal, you file directly with the Department of Industry (DoI) under the Patent, Design and Trademark Act 1965 (PDTA). The DoI is Nepal's sole patent-granting authority, and a Nepal patent is valid only within Nepal. Foreign applicants must act through a Nepal-based registered agent with a notarised Power of Attorney.

How does a Nepali inventor use the PCT?

A Nepali inventor who wants patent protection abroad files first in Nepal with the DoI to establish a priority date, then — within 12 months — files a PCT application through the receiving office of a PCT member country where the inventor has nationality or residence. In practice this means engaging a patent agent in India, China, or another nearby PCT member state to act as the receiving office. From there the international search and publication proceed as normal, and the applicant designates the target countries for the national phase. It is a workable path but adds cost and procedural complexity compared to filing from a PCT member country. Our team can help you plan the strategy — reach out here.

How does the Paris Convention connect to the PCT?

The Paris Convention for the Protection of Industrial Property, signed in 1883, established the right of priority — an inventor who files in one member country has 12 months to file in any other member country and have the later filing treated as though filed on the first date. The PCT was built directly on this foundation. The preamble to the PCT names the Paris Convention as its basis, and the 12-month Paris priority window is embedded into the PCT timeline. You file a PCT application within 12 months of your first national filing, and the PCT international phase effectively extends that priority right across all member states. The Nepal Law Commission records that Nepal acceded to the Paris Convention, so priority claims from Paris Union members are recognised in Nepal.

What does the PCT mean for patent filing in Nepal?

Because Nepal is not a PCT contracting state, you cannot designate Nepal in a PCT application. For a foreign applicant wanting protection in Nepal, the only path is a direct national filing with the DoI under the PDTA. You will need a notarised Power of Attorney, a certified copy of your home registration certificate translated into English, and a Nepal-based agent. The Nepal patent term is 7 years from the date of registration, renewable at the DoI's discretion. A common mistake we see is foreign applicants assuming a PCT filing automatically covers Nepal — it does not. Before you file, run a trademark and patent search to check for existing rights, and use our class finder if your filing involves branded goods that may also need trademark protection.

What are the legal texts that govern the PCT?

The core legal document is the Patent Cooperation Treaty itself, adopted in Washington in 1970 and amended most recently in 2001. Its companion is the PCT Regulations, which set out the detailed procedural rules and are updated annually by the WIPO Assembly. Together they run to hundreds of pages and govern every step of the international phase. The treaty is open to any state that is a member of the Paris Union — accession is by depositing an instrument of accession with the WIPO Director General. In Nepal, the governing patent law is the Patent, Design and Trademark Act 1965, as amended, which you can read through the Nepal Law Commission. For a plain-English guide to that process, see how to file a patent application in Nepal.

A realistic example: a Nepali innovator going global

Imagine a Kathmandu-based engineer who develops a new water-purification membrane. She files her patent application with the DoI on 1 January 2026, securing her Nepal priority date. She wants protection in India, the United States, and Germany. Because Nepal is outside the PCT, she engages an agent in India — a PCT member — and files a PCT application through the Indian receiving office by 1 January 2027, claiming her DoI priority. WIPO conducts the international search, and by mid-2028 she enters the national phase in all three target countries. The strategy works, but it demands careful planning and coordination across multiple jurisdictions. If she needed only Nepal protection, she would simply complete the DoI process and obtain her 7-year Nepal patent, renewable as needed. For help building a similar strategy, contact our team.

In short: The Patent Cooperation Treaty, born from the 1883 Paris Convention and signed on 19 June 1970, unified global patent filing into one streamlined international application. It does not issue patents — WIPO administers the international phase, and each country grants its own. Nepal stands outside the PCT, so patent protection here requires a direct DoI filing under the PDTA. Whether you are filing abroad or in Nepal, understanding this history helps you see exactly where your invention sits in the global IP system.

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Whether you are protecting an invention inside Nepal or planning an international filing strategy, getting the details right from day one is everything. Search existing patents and trademarks to check for conflicts, then speak with our team about your filing path — we will help you build a plan that matches your market goals.