Introduction

In the previous article, we saw how the Paris Convention gives you 12 months to file abroad while keeping your first filing date. But 12 months is short. Deciding which countries are worth the cost of patenting, and preparing translations and local filings for each, is hard to do in a year.

The Patent Cooperation Treaty (PCT) solves that problem. It lets you file a single international application and defer the expensive country-by-country decisions by roughly another 18 months.

This article explains what the PCT is, how the process works stage by stage, and how Indian applicants use it.

What Is the PCT?

The PCT is an international treaty, concluded in Washington in 1970 and in operation since 1978, administered by WIPO. It gives applicants a single, standardized way to start the patent process in all member countries at once. Over 150 countries are members, including India, the US, China, Japan and all EPC states.

The most common misunderstanding needs to be cleared up first: there is no such thing as an “international patent”. The PCT does not grant patents. It is a filing and search system. The decision to grant a patent is always taken by each national or regional patent office, under its own law.

Why Use the PCT?

• More time. You postpone the major costs of foreign filing (translations, local attorneys, national fees) until 30 or 31 months from your priority date, instead of 12.
• One application. One filing, in one language, at one office, is treated as a filing in every PCT member country.
• An early look at patentability. An international search report and written opinion tell you how your invention looks against prior art before you spend money in individual countries.
• Simpler formalities. The application is checked once against a common format, and that is accepted by every member office.

How the PCT Process Works

The process has two phases: an international phase run centrally, and a national phase run by each country.

Phase 1: The International Phase

Step 1: Filing. You file one PCT application at a receiving office (in India, the Indian Patent Office can act as receiving office), or directly with WIPO. It can claim priority from an earlier national filing made within the previous 12 months, as discussed in the Paris Convention article.

Step 2: International Search. An International Searching Authority (ISA) searches prior art and issues an International Search Report and a Written Opinion on whether the invention appears novel, inventive and industrially applicable. The Indian Patent Office is itself an ISA.

Step 3: International Publication. The application is published about 18 months after the priority date, along with the search report. This makes your invention public.

Step 4: Optional International Preliminary Examination (Chapter II). You may ask for a further examination and can amend your claims in response to the written opinion. It is optional, but useful when the first opinion is negative.

Phase 2: The National Phase

At the end of the international phase, you choose which countries to enter. You file in each chosen country’s patent office, pay its fees and provide translations where needed. The national office then examines the application under its own law and decides whether to grant.

The PCT Timeline

For an Indian applicant who files first in India and then uses the PCT, a typical timeline looks like this:

• Month 0: First application filed in India (the priority date)
• By month 12: PCT application filed, claiming priority
• Around month 16: International Search Report and Written Opinion
• Month 18: International publication
• Month 30 or 31: Deadline to enter the national phase in each chosen country

The national-phase deadline is 30 months from the priority date in many countries, such as the US, China and Japan, and 31 months in others, including India and the European Patent Office. Always check the specific deadline for each country, since some allow late entry with a fee and others do not.

Paris Convention vs PCT: The Difference

• Paris Convention: gives you a priority right (12 months for patents) so your later foreign filings count from your first filing date. You still file separately in every country within that window.
• PCT: gives you one international application and extends the time to enter individual countries to 30 or 31 months from the priority date.

They work together. Most PCT applications claim Paris priority.

India and the PCT

India joined the PCT on 7 September 1998, and it took effect for India on 7 December 1998, the same day as the Paris Convention.

In practice:

• Indian applicants filing abroad: can file a PCT application, often after a first Indian filing, and designate all member countries in one go. Inventions made in India may also need foreign filing permission under Section 39 of the Patents Act, 1970, so check this requirement before filing abroad.
• Foreign applicants entering India: enter the Indian national phase within 31 months of the priority date, under the Patents Act and Rules (see Section 138).
• India as an authority: the Indian Patent Office works as a receiving office, an International Searching Authority and an International Preliminary Examining Authority.

Common Misconceptions

• “A PCT filing gives me a patent in all member countries.” It does not. Only national or regional offices grant patents.
• “The PCT saves me money in the long run.” It mainly defers and organizes the cost. If you enter many countries, the total spend is still high.
• “The search report means I will get a patent.” The report and opinion are not binding on national offices.
• “I can file a PCT application at any time.” To keep your priority date, it must be filed within 12 months of the first application.
• “I missed the national phase deadline, so I can just file later.” Not usually. Missing the deadline can end your rights in that country.

How PATHtoIP Helps

PATHtoIP supports clients through every stage of the PCT process:

• Preparing and filing PCT applications that claim priority correctly
• Responding to International Search Reports and Written Opinions, including claim amendments
• Advising on which countries are worth entering, based on commercial priorities and budget
• Managing national phase deadlines and filings across jurisdiction

Conclusion

The PCT does not replace national patents. It gives you time, a prior art search and one filing route, so you can decide where to spend money on your invention. Together with the Paris Convention, it forms the backbone of most international patent strategies.

In the next article, we look at the Budapest Treaty, which matters for any invention involving microorganisms.

Next in the series: What Is the Budapest Treaty?