A US patent only protects you within the United States. If competitors manufacture, sell, or operate in other countries, a US patent does nothing to stop them there. International patent protection requires filing in each country where you want rights.
The total cost for international patent protection across major markets typically runs $50,000 to $150,000+ over the life of the patent family, including maintenance fees in each jurisdiction. Most of that cost comes from national phase entry fees, translations, and local attorney fees in each country.
The PCT: How International Filing Works
The Patent Cooperation Treaty (PCT) is the standard path to international patent protection. It does not grant a “world patent.” It is a streamlined process that preserves your right to file in 157 member countries while you decide where to commit.
Here is how it works:
- File a US patent application (provisional or non-provisional). This establishes your priority date.
- File a PCT application within 12 months of your US filing date. This one application preserves your rights in all 157 PCT member countries.
- Receive an international search report. The PCT search authority examines prior art across major patent databases and issues a written opinion on patentability. This helps you assess your chances before spending money on individual countries.
- Enter the national phase within 30 months of your earliest priority date. This is when you select specific countries and begin paying per-country fees.
The 30-month window is the key advantage. It gives you time to raise funding, validate your market, and make informed decisions about where protection is worth the investment.
PCT Application Costs
| Fee Component | Small Entity | Large Entity |
|---|---|---|
| PCT international filing fee | $1,278 | $1,560 |
| Search fee (USPTO as search authority) | $990 | $2,080 |
| Transmittal fee (USPTO receiving office) | $240 | $480 |
| Attorney preparation and filing | $3,000 to $8,000 | $3,000 to $8,000 |
| Total PCT filing cost | $5,500 to $10,500 | $7,000 to $12,000 |
The PCT filing is just the beginning. National phase costs come later and are typically much larger.
National Phase Costs by Country
When you enter the national phase, each country has its own filing fees, examination fees, translation requirements, and local attorney fees. These are typical ranges:
| Country/Region | National Phase Entry | Grant + 10 Years Maintenance | Key Notes |
|---|---|---|---|
| European Patent Office (EPO) | $3,000 to $7,000 | $5,000 to $15,000 | Covers up to 38 European countries. Validation in each country adds translation and local fees. |
| China (CNIPA) | $2,000 to $5,000 | $3,000 to $8,000 | Full Chinese translation required. Examination can take 2 to 4 years. |
| Japan (JPO) | $3,000 to $6,000 | $4,000 to $10,000 | Japanese translation required. Examination request must be filed within 3 years. |
| Canada (CIPO) | $1,500 to $3,500 | $2,000 to $5,000 | No translation needed for English applications. Relatively straightforward process. |
| South Korea (KIPO) | $2,000 to $4,000 | $3,000 to $7,000 | Korean translation required. Active semiconductor, electronics, and chemical patent market. |
| Australia (IP Australia) | $2,000 to $4,000 | $2,000 to $5,000 | No translation needed. Innovation patent (now phased out) was previously a lower-cost option. |
| India (IPO) | $1,500 to $3,500 | $2,000 to $5,000 | Growing market for pharmaceutical and software patents. Examination backlogs can be long. |
Translation is often the largest hidden cost. A full patent specification translated into Japanese, Chinese, or Korean can cost $3,000 to $8,000 per language. Budget for this separately.
Total Cost Examples
Startup filing in US + Europe + China: PCT filing ($8,000) + EPO national phase ($5,000) + China national phase ($4,000) + local attorneys and translations ($10,000 to $20,000) + ongoing prosecution and maintenance ($15,000 to $30,000) = $40,000 to $70,000 total
Enterprise filing in US + EPO + China + Japan + Canada: PCT filing ($10,000) + four national phases ($15,000 to $25,000) + translations ($12,000 to $25,000) + prosecution in each country ($20,000 to $40,000) + maintenance ($20,000 to $40,000) = $75,000 to $150,000 total
These are rough estimates. Actual costs depend on invention complexity, prosecution difficulty, and how many office actions you receive in each jurisdiction.
Where to File: Strategic Decisions
Most inventors and companies cannot afford to patent everywhere. The question is which countries give you the most value for your budget.
File where your key markets are. If 80% of your revenue comes from the US and Europe, those are your priorities. Filing in Brazil because it is a large country makes no sense if you have no sales there.
File where competitors manufacture. A Chinese patent is valuable if your competitors make products in China. It lets you stop infringing goods at the source, before they reach your market.
File where enforcement is effective. Some countries grant patents readily but have weak enforcement mechanisms. Germany, Japan, and the US have strong patent enforcement. Other jurisdictions may not be worth the filing cost if you cannot realistically enforce.
The most common strategy for startups: US + EPO + China. This covers the three largest patent markets at roughly $40,000 to $70,000 total and gives you enforcement options in the regions where most global manufacturing and commerce occur.
Timing: The 12-Month and 30-Month Windows
Two deadlines control the international filing process:
12-month deadline. You have 12 months from your first US filing (provisional or non-provisional) to file a PCT application. Miss this window and you lose the ability to claim your US priority date internationally.
30-month deadline. After filing the PCT, you have 30 months from your earliest priority date to enter the national phase in each country. This gives you roughly 18 additional months after the PCT filing to decide where to commit.
If you filed a US provisional in January 2026, your PCT deadline is January 2027. Your national phase deadline is July 2028 (30 months from the provisional date).
The No-Grace-Period Trap
The US gives inventors a 12-month grace period after public disclosure. Most other countries do not. If you publicly disclose your invention (sell it, demo it, publish it) before filing any patent application, you may have permanently lost patent rights in most foreign markets.
If international protection is even a possibility, file your provisional before any public disclosure. This preserves your options everywhere. See our 12-month filing deadline guide for details.
The Bottom Line
International patent protection is expensive. Budget $50,000 to $150,000+ for a multi-country strategy covering major markets. The PCT process gives you 30 months to make country-by-country decisions, which is valuable when cash is limited.
For most startups and individual inventors, start with a US patent. Add international filings only when you have clear evidence of foreign market opportunity or foreign competition. The US market alone is large enough to build a significant business, and a US patent is often sufficient leverage for licensing and enforcement.
For a breakdown of US patent costs, see the patent cost guide. For timeline details, see the patent timeline guide. Find a patent attorney in the directory or estimate US filing costs with the patent cost calculator.