How to File a Patent in Mexico: A Smart 2026 IMPI Guide

Mexico is one of Latin America’s largest patent markets, and it runs on its own rules — not Europe’s. Knowing how to file a patent in Mexico starts with one fact that reshapes your whole strategy: Mexico is not a member of the European Patent Convention, so there is no validating a European patent here and no regional shortcut. Protection is obtained nationally, through the Mexican Institute of Industrial Property (IMPI), either as a direct national filing or by entering the PCT national phase. The deadline, the language, the term and the appeal route all have Mexican specifics that trip up applicants who assume their home process carries over. Here is the sequence that actually works.

How to File a Patent in Mexico: Two Routes Into IMPI

Every Mexican patent runs through the Mexican Institute of Industrial Property (IMPI), the federal body that examines and grants patents. There is no European route and no regional grant to validate; Mexico is outside the EPC, so plan a national filing from the start.

You reach IMPI one of two ways. The first is a direct national application, filed in Mexico and claiming Paris Convention priority from an earlier foreign filing within 12 months. The second, far more common for international portfolios, is the PCT national phase: your existing international application enters Mexico as a national case. The route you choose is dictated by whether you already filed a PCT application — but either way, IMPI is the destination.

This mirrors the pattern in other non-EPC markets. Entering the PCT national phase in Australia or filing a patent in Canada works the same way: a national filing with its own deadline, not a validation of some regional grant.

The 30-Month PCT Deadline — and Why It Is Unforgiving

If you are using the PCT route, the Mexican national phase must be entered within 30 months of the earliest priority date. Mark this hard, because Mexico is stricter than many offices on what happens next: restoration of the national phase after the 30-month deadline is not available.

There is no discretionary rescue to argue, no reinstatement on a showing of due care. Miss the 30-month date and the opportunity to protect that invention in Mexico is gone. For a market this size, that makes a clean docket non-negotiable — diarise the date well ahead and build in a buffer for translation and signatures.

File in Spanish: The Translation Rule

All documents before IMPI are filed in Spanish. In practice you can secure a filing date with the application in another language, but IMPI will set a short window — generally two months — to submit the Spanish translation of the specification, claims and abstract. Build that work into your timetable rather than discovering it at the deadline.

As always, the translation is the patent. The Spanish text is what the examiner reads and what the courts will later construe, so invest in a technical translator who understands the field. A cheap translation that narrows or muddies the claims is the most expensive economy in the process.

Examination, the 2020 Law and What Is Patentable

Mexican patent practice is governed by the Federal Law for the Protection of Industrial Property, which entered into force on 5 November 2020 and modernised the old Industrial Property Law. IMPI conducts a substantive examination for novelty, inventive step and industrial application, and issues office actions you must answer within the set deadlines.

The usual exclusions apply — among them scientific principles, discoveries and methods of medical treatment — and, as in most jurisdictions, how you draft the claims often decides whether a borderline invention is allowed. Where a corresponding application has already been granted elsewhere, Mexico participates in the Patent Prosecution Highway, which can accelerate examination and reduce back-and-forth when you already hold a favourable result abroad.

• Authority: IMPI examines and grants; Mexico is outside the EPC.
• PCT deadline: 30 months from the earliest priority date, with no restoration if missed.
• Language: Spanish, with a short window to file the translation after the filing date.

Term, Annuities and What It Costs

A Mexican patent lasts 20 years from the filing date, subject to annual maintenance fees (annuities). Budget for the stack: IMPI filing fees, the Spanish translation, examination and official fees during prosecution, and the recurring annuities that keep the patent in force.

Annuities in Mexico are typically handled in blocks tied to five-year periods and must be kept current, with a grace period and surcharge for late payment before the patent lapses. Because the 2020 law also recognises certain patent-term adjustments for unreasonable administrative delay, the effective term can occasionally run slightly beyond 20 years — but plan your budget around the 20-year baseline and treat any adjustment as a bonus.

Professional fees for responding to examination are usually the largest variable. If Mexico is a defensive-only market, weigh two decades of annuities against the commercial value before you commit to the full term.

Representation and Entry-Time Housekeeping

Foreign applicants without a domicile in Mexico file through a local representative and provide a signed power of attorney; IMPI no longer requires legalisation or an apostille for a simple power, but the document must be in order at filing. Get it drafted and executed early, not in the final days before the 30-month date.

Use entry to tidy the foundations: confirm the priority claim, consider voluntary amendments to put the claims into examiner-friendly shape, and make sure the Spanish translation is complete and accurate. Mexico’s no-restoration rule means there is no second chance on timing, so the discipline you apply at entry is what protects the case.

Where Mexican Patents Are Decided: IMPI, the TFJA and Amparo

Mexico’s system is administrative first, not civil-court first, and that surprises applicants from other countries. Infringement and invalidity are decided in the first instance by IMPI itself, acting as an administrative authority rather than a court. This is a structural feature, not a quirk — plan enforcement around it.

An IMPI decision can be challenged before the Specialised IP Chamber of the Federal Court of Administrative Justice (the SEPI-TFJA), and that court’s judgment can in turn be taken to a federal circuit court through a constitutional amparo proceeding. It is a layered path, and timing and strategy at the IMPI stage shape everything that follows, so treat the administrative phase as the main event, not a formality.

Nearly all of this runs through the capital, where IMPI and the specialised chamber sit. If enforcement is realistic, line up local support early — our teams assist rights holders across Mexico, including Mexico City, Monterrey and Guadalajara.

File Your Mexican Patent With Confidence

PerspireIP helps foreign applicants and in-house teams file patents in Mexico and prosecute them to grant through IMPI — timing the 30-month national phase, managing the Spanish translation, docketing annuities, and preparing for administrative enforcement before IMPI and the SEPI-TFJA. Explore our Mexico services hub, our local support in Mexico City and Monterrey, or contact our team to map out your filing.

This article is general information, not legal advice; consult a qualified attorney for your situation.

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