Trademark Opposition: Deadlines and Strategies

Opposition is the primary instrument for challenging a third-party trademark application that, if registered, could infringe your prior rights or create a risk of market confusion. In Argentina, the procedure is governed by the Trademark Law and INPI regulations applicable at the time of the proceeding.

Procedural timing

Opposition is filed against a registration application already published by INPI, within thirty days from the date of publication. This deadline is mandatory: it is not possible to file an opposition once the opposition term has expired.

Common grounds

Among the most common arguments are the existence of prior marks, or well known marks, where there is risk of confusion or association, bad faith by the applicant, or if the public cannot tell apart the signs in the market. Each case requires appropriate evidence and legal analysis.

Strategy

A strong opposition combines law and facts: registered or marks in use, overlapping markets and channels of production or sale, evidence of actual or potential confusion, and sometimes expert reports or surveys. Clear drafting of the facts and their correlation with applicable legislation is also essential.

Costs and alternatives

Costs include official fees, professional fees, and — depending on the case — additional evidence. Where opposition is not possible or advisable, negotiations, controlled coexistence arrangements, or other subsequent actions may be evaluated, always according to the status of the proceeding and the rights involved.

After filing

The INPI processes the opposition in accordance with the applicable procedural stages (response, evidence, submissions, decision). The outcome is not guaranteed; a realistic assessment before initiating the proceeding is therefore advisable.

Conclusion

A well-founded opposition filed in time is a central tool for defending your trademark portfolio. If you have identified a conflicting publication, seek professional analysis without delay: deadlines run from publication, not from the date you became informally aware.