USPTO guide
The US foreign filing license, and the rules in India and Europe
By Mahish Guru, Co-founder and CEO, PatentAssist.ai
Updated
Before an invention made in the United States is filed in another country, the USPTO gets a chance to check it for national security. That check is the foreign filing license, and skipping it can cost you the US patent. This guide covers when the license is needed, the six-month rule, the license on your filing receipt, how to get one fast, and what to do if you filed without one. The last section covers India's section 39 and the first-filing rules in the UK, Germany and France, which catch companies that split R&D across borders.
Quick answer
- Needed when: the invention was made in the US and you file abroad before a US application has been on file for 6 months, or without any US application.
- Usual source: the USPTO filing receipt, which normally states that a license is granted.
- Fast route: a petition under 37 CFR 5.12(b), $235 for a large entity, generally decided within 3 business days.
- Risk: an unlicensed foreign filing bars a valid US patent unless it happened through error and a retroactive license is granted.
When a US foreign filing license is needed
35 U.S.C. 184(a) forbids filing abroad, or causing or authorizing a filing abroad, within six months of filing in the US, for "an invention made in this country", unless the Commissioner for Patents has licensed it. 37 CFR 5.11(a) spells out the trigger. A license is required before filing any patent, utility model or design application in a foreign country or with a foreign or international IP authority, if the invention was made in the US and:
- a US application on it was filed less than six months before the foreign filing; or
- no US application on it has been filed at all.
Three points trip people up. First, it is the place where the invention was made that counts, not citizenship or who owns it. A German subsidiary's invention made in Munich needs no US license; the same invention developed at the US parent does. When the work was split between a US team and a team abroad, get advice before the first filing anywhere. Second, "foreign or international authority" includes the EPO and WIPO's International Bureau, so a PCT application filed with RO/IB or RO/EP is a foreign filing. Only the USPTO acting as PCT receiving Office is carved out. Third, the rule covers amendments, supplements and divisionals (184(b)), so adding new US-made subject matter to a pending foreign application can need its own license (5.15(e)).
The six-month rule
Once a US application has been on file for six months and no secrecy order has been placed on it, you may file abroad without any license (37 CFR 5.11(e)(2)). Only a secrecy order can take that authority away (5.11(f); MPEP 140). This is the safety net if the filing receipt shows no license, but six months is only half of the 12-month Paris priority year, and the subject matter covered is only what the US application disclosed.
Example
A Boston startup files a US provisional on March 2, 2026. The filing receipt arrives without a license. It may file a PCT application with the USPTO as receiving Office at any time, but may not file directly at the EPO before September 2, 2026 unless it petitions for a license first. A petition filed and faxed to Licensing and Review in April would normally be decided within days.
The license on the filing receipt
Filing a US application on an invention made in the US is treated as including a petition for a license under section 184 (37 CFR 5.12(a)). If the application is not marked by the security screeners, the petition is granted, and the filing receipt states the license and the date it became effective. MPEP 140 is explicit that the grant is "not immediate or even ensured". Check the receipt before you send anything abroad.
A filing receipt license has the broad scope of 37 CFR 5.15(a): it covers filing the same subject matter abroad and later amendments, supplements and divisionals that do not change the general nature of the invention or add munitions or nuclear technology. It also authorizes exporting the technical data needed to prepare, file and prosecute the foreign application (5.11(b)); exports for that purpose without the license must instead comply with the export regulations (5.11(c), 5.18). The license does not cover exports for other purposes. MPEP 140 gives a pointed example: sending subject matter abroad to have an application prepared there for filing in the USPTO is not covered by any USPTO license, and falls under the export regulations.
Petitions, including expedited licenses
You can petition for a license under 37 CFR 5.12(b) when the filing receipt shows none, when it has not arrived yet, when there is no US application, when you want to license subject matter beyond the US application, or simply when you need speed. The petition is a letter with the fee under 37 CFR 1.17(g): $235 for a large entity, $94 small, $47 micro.
- With a US application, identify it by number, filing date, inventor and title. The license is measured by its disclosure. If the foreign text adds anything, include a copy of the foreign version or describe the new matter (5.14).
- Without a US application, attach a legible copy of the material to be licensed. The USPTO keeps it as the measure of the license (5.13). A petition license has the scope stated on it, which may be the narrower 5.15(b) scope; a further petition under 5.15(c) can ask for the broad one.
- Expedited handling. MPEP 140 says a license is generally granted within 3 business days of receipt by Licensing and Review if there is no national security concern, and encourages applicants to fax or hand deliver the request and give a fax number or contact for the reply.
Filing abroad without a license
The consequences are in three sections of the statute. Under 35 U.S.C. 185, a person who files, or consents to or assists a filing, abroad without the required license cannot receive a US patent on the invention, and any patent issued is invalid, unless the failure was through error and the invention is not within the secrecy provisions of section 181. Under 35 U.S.C. 186, willfully filing abroad in violation of section 184 is a crime punishable by a fine of up to $10,000, up to two years in prison, or both. Examiners who spot an early foreign filing on a US-made invention refer the application to Licensing and Review (MPEP 140).
The cure for an honest mistake is a retroactive license under 37 CFR 5.25. The petition lists each country and date of the unlicensed filing and includes a verified statement that the subject matter was not and is not under a secrecy order, that the license was diligently sought once the filing was discovered, and why the filing was made through error. It needs facts, not a bare allegation: statements from the people involved and copies of the filing instructions. A license only covers the specific filings listed. If the petition is finally refused in a pending application, the examiner makes a final rejection under section 185.
India and Europe have their own rules
The US rule follows the invention. The Indian and European rules mostly follow the applicant's residence, so a cross-border team can be caught by two regimes at once.
| Country | Who it applies to | Rule | Consequence |
|---|---|---|---|
| United States 35 U.S.C. 184; 37 CFR 5.11 | Any invention made in the US | License needed to file abroad unless a US application has been on file for 6 months with no secrecy order | No valid US patent (s. 185); fine up to $10,000 or 2 years for willful violations (s. 186) |
| India Patents Act 1970, s. 39 | Persons resident in India | Written permit unless an Indian application was filed at least 6 weeks earlier and no secrecy direction applies | Indian application deemed abandoned, patent revocable (s. 40); up to 2 years or fine (s. 118) |
| United Kingdom Patents Act 1977, s. 23(1), (1A) | UK residents, for applications with military, national security or public safety information | Written authority unless filed at the UKIPO at least 6 weeks earlier with no s. 22 directions | Fine, or up to 2 years on indictment, if done knowingly or recklessly (s. 23(3), (3A)) |
| Germany PatG § 52; IntPatÜG Art. II § 4(2) | Applications that contain a state secret | Written permission of the competent federal authority to file outside Germany; European applications that may contain one go to the DPMA | Up to 5 years or a fine (§ 52(2)) |
| France CPI L. 614-2, L. 614-4 | Applicants resident or based in France | European applications go through INPI unless they claim an earlier French filing; no free disclosure for 4 months from filing or 14 months from priority without authorization | See the national law |
India: section 39 foreign filing permission
Under section 39 of the Patents Act, 1970, no person resident in India may apply for a patent outside India without a written permit from the Controller, unless an application for the same invention was filed in India at least six weeks earlier and no secrecy direction under section 35 is in force. The permit is requested on Form 25. Inventions relevant for defence or atomic energy need the central government's consent. Section 39 does not apply to an invention first filed outside India by a person resident outside India (s. 39(3)). Breach makes the Indian application deemed abandoned and any patent revocable (s. 40), and is punishable with up to two years' imprisonment or a fine (s. 118).
For an Indian startup heading to the US, the simplest path is to file at IP India first, often a provisional, and wait six weeks before the US or PCT filing. The guide to filing a patent in India covers that first filing.
United Kingdom, Germany and France
UK. Since 2005, section 23 of the Patents Act 1977 applies only to applications containing information about military technology, or whose publication might harm national security or public safety. A UK resident filing such an application abroad needs written authority from the comptroller unless it was filed at the UK IPO at least six weeks earlier and no section 22 directions are in force. The offence requires knowledge or recklessness.
Germany. A patent application that contains a state secret may be filed outside Germany only with the written permission of the competent federal authority (PatG § 52), and a European application that may contain one must be filed with the DPMA, not the EPO, with an annex saying so (IntPatÜG Art. II § 4(2), per the EPO's national law table). For ordinary commercial technology there is no German first-filing duty.
France. Applicants resident or with their principal place of business in France must file European applications with INPI unless they claim the priority of an earlier French application, and the application may not be freely disclosed or used without ministerial authorization, which is deemed given four months after filing or 14 months after priority (CPI L. 614-2 and L. 614-4, as listed in the EPO's national law table).
Other EPC states have similar provisions. The EPO's table II lists, state by state, which European applications must be filed with national authorities.
Where your drafts are processed matters here too
Because the USPTO license does not cover sending US-made technical data abroad to prepare a US application, US teams should know where any drafting tool processes their data. PatentAssist.ai runs its AI processing in Azure EU regions and hosts the app in India; the security page and sub-processor list give the details your export-control counsel will need. We cannot tell you whether a license or export authorization is required for your invention. What the product does is draft claims, description, abstract and drawings in USPTO, EPO, IP India and DPMA formats.
Searching public patent records raises none of these issues: search US, European and Indian patents free.
Planning the filings themselves? See the PCT application guide, the US national stage guide and filing a US patent from abroad.
More USPTO guides
- How to file a provisional patent application (US)
What a US provisional must contain, the USPTO fees, the 12-month deadline under 35 U.S.C. 119(e), and when to skip it.
- USPTO patent fees (2026)
Every USPTO patent fee for large, small and micro entities, from filing to maintenance, with a fee calculator.
- Patent drawing requirements: USPTO, EPO and India
37 CFR 1.84, the EPO rules that replaced Rule 46 EPC, and Indian rule 15, compared side by side.
- How to write patent claims: USPTO, EPO and India
Claim structure and worked examples, then the claim rules and fees at the USPTO, the EPO and the Indian Patent Office, side by side.
- How to respond to a USPTO office action
Reply deadlines and extension fees, 101, 102, 103 and 112 rejections, interviews, and options after a final rejection.
- Types of patent searches, and which one you need
Patentability, freedom-to-operate, invalidity and landscape searches compared by purpose, timing, scope and deliverable.
- Patentability search: how to check novelty before you file
What counts as prior art under 35 U.S.C. 102 and Art. 54 EPC, the grace period gap, search steps and how to read results.
- Freedom-to-operate search in the US and Europe
In-force claims only, legal status checks at the USPTO, EPO and UPC, FTO opinions after Halo, and design-arounds.
- Invalidity search: prior art to challenge a patent
IPR, PGR, EPO opposition and UPC revocation deadlines, prior art dates, standards documents and claim charts.
- Patent landscape analysis, step by step
Building a CPC and keyword dataset, cleaning families and names, the metrics that matter and the 18-month publication lag.
- How to use USPTO Patent Public Search
Basic and Advanced Search, the three databases, field codes, ADJ, NEAR, WITH and SAME, truncation and a worked search.
- Google Patents search guide
Search operators and fields, Boolean and proximity syntax, non-patent literature, and where Google Patents falls short of the official databases.
- The Cooperative Patent Classification (CPC), explained
How CPC symbols are built, CPC against IPC, the Y section, how to find the right class and how to search it in each database.
- Patent search Boolean operators and search strings
Boolean, proximity and truncation syntax compared across Patent Public Search, Espacenet, Google Patents and The Lens, with semantic search for contrast.
- How to respond to a 35 U.S.C. 101 rejection
The Alice/Mayo steps in MPEP 2106, Ex parte Desjardins and the 2024-2026 USPTO guidance, Berkheimer evidence and Rule 132 eligibility declarations.
- How to respond to a 35 U.S.C. 102 rejection
Anticipation under MPEP 2131, AIA 102(a)(1) and (a)(2), the 102(b) exceptions, inherency and Rule 130 declarations.
- How to respond to a 35 U.S.C. 103 rejection
Graham and the KSR rationales in MPEP 2143, teaching away, motivation to combine, secondary considerations with nexus, and Rule 132 evidence.
- How to respond to a 35 U.S.C. 112 rejection
Written description and enablement after Amgen, 112(b) indefiniteness, 112(f) means-plus-function after Williamson, and 112(d) dependent claims.
- The PCT application: timeline, fees and national phase
The international phase month by month, receiving Office and ISA fees in CHF, USD and EUR, national phase deadlines by office, and a deadline calculator.
- Entering the US national stage under 35 U.S.C. 371
The 30-month deadline and revival, the 371 requirements, national stage fees by entity size, and 371 versus a bypass continuation.
- Filing a US patent from Europe or India
The 2026 US practitioner rule for foreign applicants, Paris priority and certified copies, small entity status, PCT or direct, fees and translations.
- What is a utility patent?
What a US utility patent covers under 35 U.S.C. 101, the parts of the application in 37 CFR 1.77 order, the 20-year term and USPTO costs.
- Design patents in the United States
What a design patent protects, drawings and the single claim, the 15-year term, Hague filings, LKQ v. GM, and design vs utility patents.
- How to file a nonprovisional patent application
Required parts and fees, claiming a provisional within 12 months, DOCX filing in Patent Center, and what happens after you file.
- Provisional vs nonprovisional patent application
The two US filings side by side, the cost of each route, the effect on term and publication, and a guide to which to file.
- Continuation, CIP and divisional applications
Copendency, patent term, double patenting and terminal disclaimers, the 2025 continuing application fee, and continuation strategy.
- How much does a patent cost?
USPTO fees by entity size from filing to the last maintenance fee, what drives professional fees, EPO fees, and an estimator.
- How to patent an idea in the US
Nine steps from patentability and search to provisional filing, Patent Center, examination and maintenance, with the USPTO's free help programs.
- Small entity vs micro entity status
Who qualifies under 37 CFR 1.27 and 1.29, the 2026 income limit, SB/15A and SB/15B, license traps, fixing errors, and an eligibility checker.
- How long does a patent last?
US utility and design terms, patent term adjustment and extension, terminal disclaimers, maintenance fee deadlines, Europe and India, with an expiry estimator.
- Can AI write a patent application?
What AI drafting does well and badly, the USPTO and EPO positions on AI tools, AI inventorship after 2025, and confidentiality.
- Restriction requirements and election of species
How to answer a USPTO restriction or election of species requirement, from traverse and rejoinder to divisionals and unity in 371 cases.
- Options after a final rejection
Amendment after final, advisory actions, the end of AFCP 2.0, RCE, pre-appeal and appeal, with fees, timing and USPTO outcome data.
- Request for continued examination (RCE)
What 37 CFR 1.114 requires, first and later RCE fees, patent term effects, and when an RCE beats an appeal.
- Information disclosure statements (IDS)
The duty of disclosure, IDS timing windows and fees, the 2025 size fee, EPO search reports, Therasense and QPIDS.
- PTAB ex parte appeals
Notice of appeal to decision step by step, with fees, deadlines and the PTAB's FY 2026 pendency and outcome statistics.
- Track One prioritized examination
Track One requirements, fees by entity size, the 20,000 annual cap and USPTO timing data, plus PPH and age or health petitions.
- 35 U.S.C., annotated: US patent law section by section
The current text of 34 key sections of Title 35 with plain-English summaries, key cases, 37 CFR rules and MPEP references.
Foreign filing licenses: frequently asked questions
When do I need a US foreign filing license?
When an invention made in the United States is to be filed in any foreign country, or with a foreign or international IP authority other than the USPTO as receiving Office, and either no US application has been filed or one was filed less than 6 months earlier (37 CFR 5.11(a)). After 6 months on file in the US with no secrecy order, no license is needed (5.11(e)(2)).
Does my USPTO filing receipt include a foreign filing license?
Usually. Every US application on an invention made in the US is treated as including a petition for a license (37 CFR 5.12(a)). If the security screeners do not flag it, the filing receipt says the license is granted and gives its date. If the receipt does not show a license, you cannot file abroad until 6 months have passed or you get a license by petition.
How fast can I get a foreign filing license?
File a petition under 37 CFR 5.12(b) with the $235 fee ($94 small entity, $47 micro) and ask for expedited handling. MPEP 140 says a license is generally granted within 3 business days of receipt by Licensing and Review if there is no national security concern. Without a US application, the petition must include a copy of the material to be licensed (5.13).
What happens if I filed abroad without a foreign filing license?
You cannot get a valid US patent on the invention unless the failure was through error and the invention is not subject to a secrecy order (35 U.S.C. 185). The fix is a petition for a retroactive license under 37 CFR 5.25, listing every country and date, with a verified statement explaining the error and showing the license was sought diligently once it was discovered. Willful unlicensed filing is also a crime under 35 U.S.C. 186.
Does the foreign filing license apply to non-US inventors?
No. The license requirement turns on where the invention was made, not on the inventor's nationality or the applicant's domicile. An invention made entirely in Germany or India needs no US license, even if a US company owns it (37 CFR 5.11(e)(1)). That country's own rules may apply instead.
Do Indian residents need permission to file a patent abroad?
Yes, unless they first filed the same invention in India at least six weeks before the foreign application and no secrecy direction under section 35 applies (Patents Act 1970, section 39). Otherwise they need a written permit from the Controller. Section 39 does not apply to an invention first filed outside India by a person resident outside India.
Sources: 35 U.S.C. 184, 185 and 186; 37 CFR 5.11 to 5.25 and 1.17(g); MPEP 140; Patents Act 1970 (India), sections 35, 39, 40 and 118; Patents Act 1977, s. 23; PatG § 52; EPO, National law relating to the EPC, table II (situation in January 2026). Checked October 26, 2026. This page is general information, not legal advice. Whether a license or permit is needed depends on facts only your patent counsel can assess.