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What to Do If Someone Trademarked Your Business Name

Written by Notimark Team on August 17, 2026

What to Do If Someone Trademarked Your Business Name

Understanding Trademark Priority and Rights

If you discover that someone trademarked your business name, it can be a stressful situation. The first thing to understand is the concept of trademark priority. In many jurisdictions, including the United States, trademark rights generally belong to the party who first uses the mark in commerce, not necessarily the one who registers it first. This means that if you were using the name in your business before the other party filed for a trademark, you might have a case for challenging their registration. Learn more about the differences between trademarking a business name and forming an LLC.

Common Law Rights

Even without a formal registration, you might have what are called “common law” rights. These rights arise from actual use of the trademark in commerce within a specific geographical area. While common law rights can be powerful, they are limited compared to registered trademarks, which offer broader protection.

First-to-Use vs. First-to-File Systems

It’s important to know whether your jurisdiction follows a “first-to-use” or “first-to-file” system. In a first-to-use system, like the U.S., the first person to use the trademark in commerce typically has stronger rights. In a first-to-file system, the first person to register the trademark generally holds the rights, even if another business was using the name first.

Steps to Take When Someone Trademarked Your Business Name

Gather Evidence of Prior Use

Your first step should be to collect evidence showing your use of the business name predates the other party’s trademark filing. This could include:

  • Invoices and contracts: Documents showing the name was used in business transactions.
  • Marketing materials: Brochures, ads, or website content displaying the name.
  • Social media posts: Proof of the name being used online.

Consult a Trademark Attorney

Trademark law can be complex, and the consequences of making a mistake are significant. Consulting a trademark attorney can help you understand your rights and the best course of action. They can assist in evaluating the strength of your evidence and whether you have a viable claim.

File a Trademark Opposition

If the trademark application is still pending, you can file an opposition against it. This is a formal objection to the registration, often filed with the trademark office within a specific time frame after publication of the application. An opposition argues that the trademark should not be registered because it conflicts with your prior rights.

Petition for Cancellation

If the trademark has already been registered, you might need to file a petition for cancellation. This legal procedure challenges the validity of the existing trademark registration. Grounds for cancellation can include prior use, fraud, or lack of legitimate use by the registrant.

How Trademark Monitoring Helps

Using a service like Notimark can be beneficial in these situations. Notimark helps you keep track of new or pending trademarks that match your business name. This proactive approach allows you to address potential conflicts early, possibly before the other party’s trademark is registered.

Possible Outcomes

  • Coexistence Agreement: Sometimes, both parties can agree to use the name under specific conditions, allowing both to operate without legal conflict.
  • Rebranding: If the other party’s claim is strong, you might need to consider rebranding your business to avoid further legal issues.
  • Legal Resolution: Ultimately, if negotiations fail, the matter might need to be resolved in court.

FAQ

Can I still use my business name if someone else trademarked it?

It depends on whether you have prior rights under common law or if you’re in a first-to-use jurisdiction. Consulting a trademark attorney is advisable.

How do I oppose a trademark application?

You will need to file a formal opposition with the trademark office, often within a specific time frame after the application is published.

What is a coexistence agreement?

A coexistence agreement is a legal arrangement where two parties agree to use similar trademarks without conflict, often by defining geographical or industry boundaries.

How can I prevent this from happening again?

Consider registering your trademark and using a monitoring service like Notimark to watch for similar filings.