Trademark Opposition: What It Is and How to Respond (2026 Guide)
A trademark opposition can stop your application in its tracks — or be the tool you use to block a conflicting mark. This guide explains how oppositions work and what to do if you are involved in one.
Free Trademark Search →What is a trademark opposition?
After the USPTO approves an application, the mark is published in the Official Gazette for 30 days. During that window, a third party who believes your mark would harm them — usually because it is confusingly similar to theirs — can file a Notice of Opposition with the TTAB. The opposition is an adversarial proceeding, similar to a streamlined lawsuit, decided by the Board.
How the opposition process works
The opposer files a Notice of Opposition stating their grounds (commonly likelihood of confusion or priority). The applicant must file an answer within 40 days or face default judgment. The case then moves through disclosures, discovery, trial briefs, and a decision. Many oppositions settle through coexistence agreements or amendments before reaching a final ruling.
What to do if your application is opposed
1. Do not ignore it. Missing the answer deadline can forfeit your application. 2. Assess the conflict. Review the opposer's grounds and the strength of their mark. 3. Consider your options. These include negotiating a coexistence agreement, amending your goods or services, defending the opposition, or — if filing first matters — opposing a conflicting mark yourself. Acting early keeps the most options open.
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Get Expert HelpFrequently asked questions
What is a trademark opposition?
It is a formal challenge to a pending trademark application, filed with the USPTO's Trademark Trial and Appeal Board during the 30-day publication window by a party who believes the registration would harm them.
How long do I have to respond to an opposition?
You generally must file an answer within 40 days of the Notice of Opposition. Missing the deadline can result in a default judgment against your application.
What are common grounds for opposition?
The most common ground is likelihood of confusion with an existing mark. Others include descriptiveness, lack of distinctiveness, priority of use, and dilution.
Can I oppose someone else's trademark?
Yes. If a published application is confusingly similar to your mark, you can file a Notice of Opposition during its publication window. Trademark monitoring helps you catch these in time.
Do I need a lawyer for a trademark opposition?
Oppositions are adversarial TTAB proceedings and many parties use attorneys. Secure Mark USA provides filing support and guidance and is not a law firm.
Helpful resources
Trademark Monitoring Office Action Response Trademark Registration Free Trademark Search Trademark Consultancy
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