A Mexican patent normally lasts twenty non-extendable years from the date recognized by law, but the current regime provides for a supplementary certificate when unreasonable delays directly attributable to the IMPI reduce the effective time. The benefit is not automatic and the window to request it is narrow. In addition, files processed under the previous legislation require a different analysis. This note explains how to separate the regimes and prepare the request. It is informational material and does not constitute legal advice.
The current supplementary certificate
The Federal Law for the Protection of Industrial Property allows a supplementary certificate to be requested when, between the filing in Mexico or entry into the national phase and the grant, more than five years elapse due to unreasonable delays directly attributable to the Institute. The maximum adjustment is five years and is calculated, in legal terms, at the rate of one day for every two days of unreasonable delay. Not all the excess time counts: ordinary examination periods, the applicant's actions or omissions, additional deadlines, remedies outside the Institute and force-majeure situations are deducted. Therefore, the age of the file is only the start; a causal chronology is needed.
A window that must not be missed
The request is filed only once, in a separate writing, when responding to the communication by which the IMPI reports that the grant is appropriate and asks that the final requirements be met. It must identify the file and the relevant dates, present arguments and include the payment. A later request is considered untimely. If the Institute requires omissions to be corrected, the law grants a short period of five days. The certificate, if granted and the patent remains in force, takes effect on the day after the original expiry. An alert system must flag files near the threshold from the start, but the decision and the final calculation must be reviewed before responding to the grant notice.
Files under the previous law
Patents applied for under the repealed Industrial Property Law must not be treated as if the current supplementary certificate applied to them automatically. The Supreme Court issued a criterion on administrative delays under that regime and linked effective protection to the standard of seventeen years from the grant in the case analyzed. Its use requires reviewing the filing date, transitional rules, procedural history and the scope of the precedent. Mixing the two paths can lead to requesting the wrong remedy or out of time. The portfolio audit must separate files by applicable law, document attributable delays and keep official letters, filings and acknowledgments that make it possible to prove the sequence.
Key points
- Exceeding five years of processing is not enough: the relevant delay must be directly attributable to the IMPI.
- The calculation excludes reasonable periods and delays caused by the applicant.
- The request is filed at a specific stage and cannot be reserved for later.
- Patents under the previous law require a separate transitional and case-law analysis.
What to review
- Classify the portfolio by filing date and applicable legislation.
- Build a chronology that distinguishes times of the IMPI, the applicant and third parties.
- Set up an alert to review the certificate before responding to the grant notice.