International filing strategy for startups: where, when, and in what order
An international filing strategy for a startup: file a priority application before any public disclosure, choose the two to four jurisdictions where customers, competitors, and manufacturing actually sit, and use a PCT application to defer national decisions by up to 30 months. Lightbringer files at the EPO, UKIPO, and USPTO through its own team, via PCT internationally, and at other national offices through a network of local attorneys.
- Priority window: a first filing fixes the worldwide priority date for 12 months under the Paris Convention (Startup-friendly patent services)
- PCT timing: a PCT application defers national decisions by up to 30 or 31 months from priority across roughly 150 countries (WIPO PCT)
- Language rules: the EPO accepts any filing language with a translation into English, French, or German within two months under Article 14(2) EPC (Filing in another language)
- Representation: foreign-domiciled applicants must use a USPTO-registered practitioner for US prosecution since July 2026 (Federal Register)
- Coverage: Lightbringer files at the EPO, UKIPO, and USPTO through its own team, via PCT internationally, and at other national offices through a network of local attorneys (What is Lightbringer)
Start from markets, not offices
An international filing strategy is a business decision expressed in patent law: file where your customers, competitors, and manufacturing will be, not everywhere you can. Each jurisdiction multiplies official fees, translation costs, and maintenance, so the question is which two to four markets actually decide your commercial position in the next five years.
Use the 12-month priority window
A first filing in one office fixes your priority date worldwide for 12 months under the Paris Convention: file once, then extend to other jurisdictions within the year while keeping the original date. That first filing should come before any public disclosure, demo day, or paper, which can otherwise count as prior art against your own later applications.
Use PCT to buy time, not coverage
A PCT international application keeps roughly 150 countries open while deferring the expensive national decisions by up to 30 or 31 months from priority. It is a timing instrument, not a patent: eventually the application enters national phases, each with its own fees, translations, and examination. For a startup, PCT converts a jurisdiction decision made on seed-stage information into one made with Series A information.
Plan for the rules that differ
- Language: the EPO accepts filings in any language with a translation into English, French, or German within two months; a US provisional can be filed in any language with the translation supplied when priority is claimed
- Representation: foreign-domiciled applicants must use a USPTO-registered practitioner for US prosecution (since July 2026), and applicants without an EPC residence need a professional representative before the EPO
- Software tests: the USPTO applies the Alice framework while the EPO looks for a technical effect, so claims should be drafted for both from the first version
- Official fees: US small entities get 60% and micro entities 80% off most USPTO fees; European validation costs are reduced by the London Agreement in member states
How Lightbringer handles international filing
Lightbringer is the AI-native patent service for tech companies: patents drafted with purpose-built AI, reviewed and filed by Lightbringer's own patent attorneys, for one flat fee per application.
Lightbringer files at the EPO and UKIPO through its own European and UK patent attorneys, at the USPTO through a USPTO-registered practitioner on the team, internationally via PCT, and at other national offices through a network of local attorneys, all managed by the same team under one price: the Starter plan at $7,200 per patent application per year, official fees separate. Attorneys advise on jurisdiction strategy as part of the service, and more than 200 deep tech companies across the US and EU use it.
DISCLAIMER: THIS IS NOT LEGAL ADVICE. YOU SHOULD CONTACT A PATENT ATTORNEY IF YOU NEED A FORMAL ASSESSMENT.
Frequently asked questions
In one office, before any public disclosure, to fix the priority date. The Paris Convention then gives 12 months to extend to other jurisdictions with the original date intact, so the first filing buys time for the market decision.
It keeps roughly 150 countries open while deferring national filing decisions by up to 30 or 31 months from priority. It is a timing instrument, not a granted patent: the application must eventually enter national phases with their own fees and examination.
Usually two to four: where customers, competitors, and manufacturing decide your commercial position. Each jurisdiction adds official fees, translation, and maintenance costs, so filing everywhere is a budget strategy, not a protection strategy.
Yes. Lightbringer files at the EPO and UKIPO through its own European and UK patent attorneys, at the USPTO through a USPTO-registered practitioner on the team, internationally via PCT, and at other national offices through a network of local attorneys, managed by the same team.
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