INTERNATIONAL PATENT FILING
PCT Application Complete Guide for Startups and Inventors
Understand what a PCT application is, how the process works, when to use it, and what to know before national phase filing.
For startups and inventors, protecting an invention in one country is already a major decision. Protecting the same invention across the United States, Europe, India, Japan, China, or Australia can feel far more daunting — each country has its own filing fees, local agent rules, translation needs, examination process, and deadlines. Filing separately in all of them at once is expensive and, early on, often premature.
This is where a PCT application helps. It gives you a structured international filing route that keeps your options open in many countries before you commit to where you actually want protection. What it does not do is give you a worldwide patent. Instead, it gives you time, flexibility, and useful information before you enter the national phase in selected countries.
This guide explains what a PCT application is, how the process and timeline work, what it costs, when startups and inventors should use it, and the mistakes to avoid before national phase filing.
A PCT application gives startups and inventors a structured international filing route. It allows them to keep patent options open in many countries before deciding exactly where to continue the patent process.
KEY TAKEAWAYS
Delays major filing costs
Keeps options open in multiple countries
Provides search results and prior art insights
Gives more time to decide target markets
Does not grant a worldwide patent
National phase filing is still required
What Is a PCT Application?
A PCT application is a patent application filed under the Patent Cooperation Treaty, commonly called the PCT. It is an international patent filing system that allows you to file one international application instead of immediately filing separate patent applications in many countries.
A PCT application is also called an international application and has the same legal effect as filing separate national or regional patent applications in all PCT Contracting States. This does not mean you automatically get a patent everywhere. You must enter the national phase to seek a patent.
What a PCT application does — and does not do
WHAT IT DOES
- File one international application first
- Preserve your filing position in PCT member countries
- Delay major national phase filing costs
- Receive international search results
- Understand possible prior art before heavy spending
- Get more time to decide which countries matter
- Support investor, licensing, or market-entry discussions
WHAT IT DOES NOT DO
- Grant a worldwide patent
- Automatically protect your invention in every country
- Replace national phase filing
- Guarantee that any country will grant a patent
- Remove the need for local patent examination
- Remove country-specific fees, translations, or local legal requirements
Why Startups and Inventors Use the PCT Route
The PCT route helps you buy time, reduce early costs, and make better business decisions.
More Time
Delay the national phase decision. Enter the national phase around 30–31 months from the priority date, depending on the country.
Cost Efficiency
Avoid high upfront costs in multiple countries. Pay major fees only for the countries you choose later.
Valuable Information
Get an international search report and written opinion before investing heavily in multiple national phase filings.
Better Business Decisions
Make stronger decisions about markets, partners, and product strategy with more data and time.
How the PCT Application Process Works
The PCT process has two main parts: the international phase and the national phase.
INTERNATIONAL PHASE
NATIONAL PHASE
File PCT Application
File with Receiving Office (RO). Get filing date.
International Search
ISA prepares International Search Report.
International Publication
Published at 18 months.
Optional Examination
Request IPEA Written Opinion.
30–31 months from priority date.
National Office Examination
Each country examines application.
Note: Timelines and requirements may vary by country and case type.
Important Terms to Understand
Priority Date
The filing date of your earliest application. It sets your priority for patent rights.
International Search Report
Report on prior art and patentability prepared during the search.
Written Opinion
Non-binding opinion on patentability based on the search report.
International Publication
Published approximately 18 months from the priority date.
National Phase
Stage where you file in selected countries to seek patent protection.
National Phase Deadline
Usually 30–31 months from the priority date depending on the country.
International Phase vs National Phase
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Factor
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PCT Route
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|---|---|
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Initial Filing
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One application
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Cost (Early Stage)
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Lower upfront cost
|
|
Time to Decide Countries
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Up to 30–31 months
|
|
Search Report
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Yes
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Search Report
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International Search Report
|
|
Best For
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Early-stage startups, uncertain markets
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National Phase
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|---|
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File in each selected country
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Individual national filing costs
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Country-specific examination begins
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Translation, local fees, and agent fees
|
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Each country decides on patent grant
|
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Countries where protection is actually sought
|
Table of Contents
PCT AT A GLANCE
158+
Contracting States worldwide
Thousands
of applicants use PCT every year
30–31 Months
Typical time to enter national phase
Stronger Decisions
More time + information before major investments
PCT TIMELINE AT A GLANCE
Day 0
File PCT Application
3–6 Months
International Search Report
18 Months
Publication
30–31 Months
Enter National Phase
Each Country
Patent Grant (if allowed)
When Should You Use a PCT Application?
- Want protection in multiple countries but are not sure which ones yet.
- Need more time to test your product and market.
- Want to reduce early-stage costs.
- Are seeking investors or partners and need more time.
- Want to make informed decisions based on search results.
When a PCT Application May Not Be the Best Option
- Need a patent only in one country.
- Want the fastest possible patent in one country.
- Do not want to pay PCT fees at all.
India-Specific Note
Indian applicants filing a PCT application must comply with Section 39 of the Indian Patents Act. If the invention was developed in India, permission from the Controller may be required before filing abroad.
Complete PCT Filing Checklist
- Invention fully documented
- Claims properly drafted
- Description with best mode
- Drawings (if applicable)
- Prior art search completed
- Inventor details finalized
- Applicant details finalized
- Power of attorney (if required)
- Check priority strategy
- Budget and country plan prepared
Common Mistakes to Avoid
- Thinking PCT gives a worldwide patent.
- Missing the national phase deadline.
- Underestimating translation and local fees.
- Choosing too many countries without a strategy.
- Ignoring the international search report.
Practical Example
Imagine a health-tech startup develops a wearable device that monitors patient movement and alerts caregivers. It first files a provisional or national application in its home country while the product is still in testing and the team is talking to investors.
Within 12 months, the startup files a PCT application. Now, instead of immediately filing in five or six countries, it gets breathing room. During the international phase it receives the search results and studies whether the invention is likely to face serious prior art objections. It uses that period to improve the prototype, speak with hospitals and distributors, raise seed funding, study competitor markets, and decide where protection matters most.
Before the national phase deadlines, it chooses key markets — say the U.S., Europe, India, and Japan. The PCT route lets it avoid spending heavily in multiple countries too early, keeping international options open while the business model becomes clearer.
Final Thoughts
- A PCT application is one of the most useful filing routes for startups and inventors who want to keep international patent options open. It won’t give a worldwide patent or protect you everywhere automatically — but it gives time, flexibility, and useful information before you make expensive country-by-country decisions. Use that time to raise funding, test markets, review search results, and choose countries based on real business value. The best PCT strategy isn’t about filing forms; it’s about aligning patent protection with your product, funding, and long-term goals.
Frequently Asked Questions
What is a PCT application?
An international patent application filed under the Patent Cooperation Treaty. It lets you start the patent process for many countries through one international filing, instead of filing separately in each country at the outset.
Does a PCT application give worldwide patent protection?
No. It does not grant a worldwide patent. Patents are granted later by national or regional offices during the national phase — the PCT is an international filing route, not a single global patent.
How long does the PCT process take?
It gives you until around 30 or 31 months from the priority date to enter national or regional phases, depending on the country. The search report typically arrives around 16 months, and the application is usually published at about 18 months.
What is the national phase in a PCT application?
The stage where you enter selected countries to actually pursue patents, usually by around 30 or 31 months from the priority date. It involves national fees, local agents, translations, and examination under each country’s law.
What is the difference between a PCT application and direct national filing?
A PCT starts with one international filing and lets you delay choosing countries and paying national costs until about 30 months. Direct national filing means filing separately in each chosen country earlier. PCT suits applicants still deciding markets; direct filing suits those who already know their countries.
Can an individual inventor file a PCT application?
Yes, provided you are a national or resident of a PCT contracting state. Many individual applicants from developing countries also qualify for reduced PCT fees.
When should I file a PCT application?
If you’ve already filed a first application, you generally must file the PCT within 12 months of that filing to claim its priority date. Plan your strategy well before that deadline.
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