How to File a Patent in Mexico with IMPI

Filing a patent in Mexico means dealing with IMPI, the Instituto Mexicano de la Propiedad Industrial (the Mexican Institute of Industrial Property), the office responsible for industrial property in Mexico. It is worth being precise about which office does what, because Mexico splits IP administration. IMPI handles patents, utility models, industrial designs and trade marks. A separate body, INDAUTOR (the Instituto Nacional del Derecho de Autor, the National Copyright Institute), handles copyright, including the copyright register and the distinctive reserva de derechos (reservation of rights). Patents go to IMPI, not INDAUTOR. This guide walks through the route from filing to grant, the utility-model alternative, and the two main ways foreign applicants reach Mexico: the Patent Cooperation Treaty (PCT) national phase and the Paris Convention priority route. For the wider picture of protecting an invention in Mexico, see our Mexico patents overview.

This is general information rather than legal advice, and the procedure is governed by Mexican statute that has changed in recent years, so treat the timelines below as orientation and confirm the current periods with IMPI or local counsel before you act.

What you can protect, and the core requirements

Mexico grants patents for inventions across most fields of technology. To be patentable, an invention generally needs to satisfy three substantive conditions, which IMPI assesses during examination.

The first is novelty. The invention must not already form part of the state of the art, meaning it must not have been made available to the public anywhere, by any means, before the filing date (or the priority date, if you claim priority). Mexico applies an absolute novelty standard, so a disclosure you make yourself can defeat your own application. Mexican law does provide a grace period for certain disclosures originating from the inventor, but the conditions and the length of that period are specific and easy to get wrong, so confirm the current rule with counsel rather than rely on it.

The second is inventive step. Even if the invention is new, it must not have been obvious to a person skilled in the relevant field from what was already known. This is the requirement that most often determines whether a patent is granted.

The third is industrial applicability. The invention must be capable of being made or used in industry. Beyond these, Mexican law excludes certain subject matter from patentability, and the boundaries are technical and have evolved, so confirm what is patentable for your particular invention with Mexican counsel.

Filing language: Spanish, and the specification and claims

Spanish is the filing language at IMPI. A Mexican patent application is examined on a Spanish-language specification, comprising the description, the claims, an abstract and any drawings. Foreign applicants therefore need a Spanish translation prepared, and translation quality matters: ambiguities or errors introduced in translation can narrow your claims or create objections that are awkward to fix later, because amendments generally cannot add matter beyond the original disclosure.

The description must disclose the invention clearly and completely enough for a skilled person to carry it out. The claims define the scope of protection and must be supported by the description. Mexican practice allows a filing date to be secured and the Spanish translation or certain formal elements to be completed within a prescribed later period in defined circumstances, but the availability and exact deadlines are specific and have changed, so treat this as a confirm-with-counsel point. The safe planning assumption is that you will need a careful Spanish translation prepared or reviewed by someone who understands both the technology and Mexican claim drafting.

The local-representative requirement

A foreign applicant with no domicile in Mexico must, under Mexican practice, appoint a local representative (an agent with an address in Mexico) to act before IMPI and receive official correspondence. This is a procedural requirement distinct from the practical decision to engage a patent attorney, although in practice the representative is commonly a Mexican IP attorney or agent. Engage them early, because for most foreign filers this is effectively necessary, and confirm with counsel exactly who must be appointed and what power of attorney is required.

On filing you pay official fees. The cost of obtaining a Mexican patent is driven by several factors rather than a single figure: the official filing fee, examination fees, the cost of translation into Spanish, attorney fees, the number of claims, and annuity fees once the application is on file and after grant. Official fees apply; confirm the current amount with IMPI or local counsel rather than relying on any figure quoted second-hand.

Examination under the 2020 Federal Law

Mexico modernised its industrial property system with the Federal Law for the Protection of Industrial Property, which took effect in late 2020 and replaced the previous industrial property law. The current framework governs how IMPI examines and grants patents, so where older guidance conflicts with the current law, the current law prevails. This is one reason to confirm procedural detail against the present statute rather than older summaries.

IMPI conducts a formalities check and then a substantive examination against the patentability requirements and for clarity and support. If the examiner identifies problems, IMPI issues an office action setting out the objections, to which the applicant responds by argument and by amending the claims or description, within the limits on adding new matter. There can be more than one round of office actions. Missing a response deadline can result in the application being treated as abandoned, so the response periods are deadlines to diary carefully; confirm the current periods, and any available extensions, with IMPI or counsel.

Publication

A pending patent application is published in IMPI's official gazette after a defined period, which has conventionally been around eighteen months from the filing or priority date, making the application available to the public. Confirm the current publication timing with IMPI, as it is set by statute and regulation.

Grant and annuities

If the examiner is satisfied, IMPI issues the grant and the patent is registered and published, subject to payment of the relevant fees. The patent term runs from the filing date for a defined number of years (conventionally twenty years for patents), subject to maintenance. The current law also provides, in defined circumstances, for an adjustment to compensate for unreasonable delay in prosecution attributable to the office, but the conditions and mechanics are specific, so confirm the exact term and any adjustment rules with counsel, as they are statute-specific.

A Mexican patent is maintained by paying annuities (renewal fees). The schedule and timing are specific to Mexican practice, and late payment may be possible within a grace period on payment of a surcharge, with loss of the right if annuities lapse. Official fees apply; confirm the current annuity schedule and any grace period with IMPI or local counsel, and diary the dates, because an unpaid annuity can extinguish an otherwise valid patent.

The utility-model alternative

Mexico offers a utility model (modelo de utilidad) as an alternative for certain inventions, particularly those concerning the form, configuration or arrangement of an object that gives it a new function or advantage. Utility models typically face a lower inventive threshold than patents and carry a shorter term, which can suit short-lifecycle products or incremental improvements where speed and cost matter more than a long monopoly. The subject-matter scope and procedure differ from patents, so it is a considered choice rather than a default. Our Mexico utility model guide covers the trade-offs and how a utility model sits alongside the patent route.

Reaching Mexico from abroad: PCT and Paris priority

Most foreign applicants reach Mexico by one of two international routes, and the choice usually depends on how many countries you are targeting and your timing.

The PCT national-phase route is common where you want protection in several countries. You file a single international application under the PCT, which preserves an effective filing date across all member states, then later enter the national phase in each country you choose, including Mexico, by meeting IMPI's requirements (translation into Spanish, national fees and any local formalities) within the prescribed national-phase deadline. Treat that deadline as hard: the Mexican national-phase entry deadline is generally non-extendable, and a late entry usually cannot be cured, so confirm the current deadline with IMPI or counsel and diary it well in advance, as missing it generally forfeits the chance to patent in Mexico through that application. For how the international system works generally, see our PCT guide.

The Paris Convention priority route suits applicants filing directly in a smaller number of countries. If you file a first application in one Paris Convention country, you can file a corresponding application in Mexico within the Paris priority period (conventionally twelve months for patents, but confirm the current period) and have the Mexican application treated, for assessing prior art and intervening filings, as if filed on your original priority date. The two routes are not mutually exclusive: a PCT application itself commonly claims Paris priority from an earlier national filing.

Where to get this right

Mexican patent prosecution rewards early filing, accurate Spanish drafting, appointment of a competent local representative, and disciplined diary management of the office-action response deadlines, the national-phase or Paris priority entry deadline, and the annuity schedule. Getting any of these wrong can be fatal to the application or the granted patent.

IPEnvoy is not a law firm and does not provide legal advice. This page is general information to help you understand the process, not advice on your specific invention; confirm the current position on IMPI's official website and with a qualified local IP professional. IPEnvoy can connect you with vetted local counsel in Mexico and coordinate filings across multiple jurisdictions where you need protection in more than one market.