How to Oppose a Similar Trademark Filed After Yours

If someone files a trademark similar to yours, you can usually stop it by filing an opposition after the office publishes their application. The window is short: about 30 days in the US (extendable), three months at the EUIPO and two months in the UK (extendable to three). Miss it and your options get slower and more expensive.

This guide walks through what to do the moment you spot a similar filing, how opposition works at the major offices, what the deadlines are and what you can still do if the window has already closed. It is written for brand owners, not lawyers, so it focuses on decisions and timing rather than procedural detail. Rules change, so always confirm the current deadline and fee with the office handling the case.

Why a later filing is your problem, not the office's

Many owners assume the trademark office will protect them automatically. Sometimes it does, often it does not.

The USPTO examines new applications for likelihood of confusion with earlier registered and pending marks, and an examiner can refuse a later application on that ground. That helps, but it is not a guarantee. Examiners can take a different view of similarity than you would, and they look only at the register, not at your real-world reputation.

The EUIPO works differently. It does not refuse an EU trademark application on the basis of an earlier mark on its own initiative. It relies on owners of earlier rights to file oppositions. In practice, if you hold an earlier mark and do nothing, a confusingly similar EU application can proceed to registration.

The UKIPO sits in between. Examiners search for earlier marks and tell the applicant about potential conflicts, and owners of earlier UK marks can be notified. But the office will not refuse the later application on relative grounds alone if the applicant decides to proceed. Again, it is the earlier owner who has to act.

The common thread is simple. The burden of protecting your mark sits mostly with you, and the cheapest moment to act is during the opposition window.

What to do in the first 48 hours

When you first see a similar filing, resist two instincts: panicking and ignoring it. Work through these steps instead.

1. Confirm the details. Note the application number, the office, the filing date, the applicant, the exact mark and the goods and services listed. Save a copy of the record from the official register.
2. Check the status. Has it been published for opposition yet, or is it still under examination? The status tells you whether the clock is already running.
3. Find the deadline. Work out the last day to oppose or to request an extension at that office. Put it in a calendar that more than one person watches.
4. Compare honestly. Look at how the marks look, sound and what they mean, and how close the goods and services are. Overlapping classes matter, but so do related goods in different classes.
5. Check your own rights. Which of your marks are registered, which are pending and in which territories? An opposition needs an earlier right in the territory concerned.
6. Decide on the next step. The realistic options are doing nothing, contacting the applicant, filing an extension or a notice to keep the window open, or filing the opposition itself.

How to assess the overlap honestly

Before spending money, test your instinct against the same factors an office uses. Write a short answer to each question.

• Do the marks look alike? Shared beginnings matter more than shared endings, because people tend to read and remember the start of a word.
• Do they sound alike? Say both out loud in the languages of the market. Different spellings that sound the same are a classic conflict.
• Do they mean the same thing? A translation or a clear allusion to the same idea can create conflict even when the words look different.
• Are the goods or services the same or related? Identical goods make even moderate similarity risky. Unrelated goods can make close marks coexist.
• How distinctive is your mark? An invented word earns broad protection. A descriptive or common word earns narrow protection, and others may be entitled to use similar terms.

If most answers point to a real overlap, act. If most point the other way, record why and keep watching. A similarity score from a search tool helps rank cases, and you can compare a new filing with your trademark in Trademarking, but the decision on a contested case deserves a human view.

Opposition deadlines by office

These are the general opposition periods at the offices most of our users care about. They are a starting point, not a substitute for checking the office's current rules on the specific case.

Office	When the clock starts	Opposition period	Extensions
USPTO (United States)	Publication in the Official Gazette	30 days	Can be extended, up to 180 days from publication in total
EUIPO (European Union)	Publication of the EU trademark application	3 months	No extension of the opposition period itself
UKIPO (United Kingdom)	Publication in the Trade Marks Journal	2 months	Can be extended to 3 months by filing a notice of threatened opposition within the first 2 months
Canada (CIPO)	Advertisement in the Trademarks Journal	2 months	Extensions available under the office's rules
Australia (IP Australia)	Advertisement of acceptance	2 months	Extensions only in limited circumstances

Sources: the opposition rules published by the USPTO, EUIPO, UKIPO, CIPO and IP Australia. Check each office's current guidance before you rely on a date.

A note on international registrations

An international registration under the Madrid System is a bundle of national or regional protections. Opposition does not happen at WIPO. It happens at each designated office under its own rules. For example, when an international registration designates the European Union, the EUIPO republishes it and the opposition period runs for three months, starting one month after that republication. If you watch only national registers, you can miss marks that arrive through the Madrid System, so a good watch covers both.

How an opposition actually works

The details vary, but most oppositions follow the same broad shape.

Filing the notice

You file a notice of opposition with the office, identify your earlier rights, state your grounds and pay the official fee. The most common ground is likelihood of confusion with an earlier mark. Depending on the office, other grounds can include bad faith, reputation of the earlier mark or earlier unregistered rights.

Cooling off and negotiation

Some offices build in time to settle. At the EUIPO, for instance, an admissible opposition is followed by a cooling-off period during which the parties can negotiate, and that period can be extended if both agree. A large share of oppositions end here, often with the applicant narrowing its list of goods and services or agreeing to a coexistence arrangement.

Evidence and arguments

If the case continues, each side files evidence and arguments. For an opposition based on an older registration, you may need to prove that you have genuinely used your mark if the applicant asks for proof of use and your registration is old enough for that request to be allowed. This is a common surprise for owners who registered broadly and use the mark narrowly.

The decision

The office decides whether the later application is refused in whole, refused in part or allowed. Either side can usually appeal. Costs vary widely depending on how far the case goes and whether you use a representative.

Options besides a formal opposition

An opposition is not the only tool, and it is not always the best first move.

• A letter to the applicant. Many applicants did not search properly and will narrow or withdraw their application once they understand the conflict. A polite, specific letter can solve the problem without any official fees. Keep an eye on the deadline while you talk.
• A letter of protest in the US. Before publication, a third party can submit evidence to the USPTO that is relevant to the examination of a pending application, such as an earlier registration the examiner might have missed. It is not an opposition and does not make you a party, but it can lead to a refusal.
• A coexistence agreement. If the marks are similar but the businesses really are different, both sides may agree on how each will use its mark. This can be cheaper and more durable than a contested case.
• Doing nothing, on purpose. Sometimes the honest answer is that the overlap is weak. Record why you decided not to act, so the decision is easy to revisit if the other party expands.

If the opposition window has closed

Missing the opposition deadline is not the end, but it changes the economics.

Once a mark is registered, you can usually challenge it through a cancellation or invalidity action. In the US, a petition to cancel goes to the Trademark Trial and Appeal Board. In the EU, an invalidity action based on earlier rights can be filed at the EUIPO. In the UK, invalidation proceedings go to the UKIPO.

These actions tend to take longer, can be more expensive and come with their own time limits. In the US, some grounds for cancellation, including likelihood of confusion, are generally only available within the first five years after registration. In the EU and UK, if you knowingly tolerate the use of a later registered mark for five consecutive years, you can lose the right to challenge it on the basis of your earlier mark. Waiting is rarely neutral.

How to never miss a window again

Almost every missed opposition has the same cause. Nobody saw the filing in time. Registers publish thousands of new applications every week, and manually checking them for every mark in every territory is not realistic for most teams.

That is the job of trademark monitoring. A watch compares new filings against your marks, scores similarity and tells you about relevant ones with the deadline already calculated. In Trademarking, every alert shows the office, the application number, the similarity percentage, the classes and the opposition deadline, and you can start an opposition draft from the alert itself. The similarity score is an estimate based on public registry data, not legal advice, and Trademarking is not a law firm, so meaningful cases still benefit from a professional review.

Watching is included from the first plan, and teams that manage many marks or clients can see what each plan covers on the trademark monitoring pricing page.

A simple checklist for brand owners

• Know which of your marks are registered and pending, and in which territories.
• Watch the registers where you sell, including international registrations that designate those territories.
• When a similar filing appears, record the deadline the same day.
• Compare marks and goods honestly before spending money.
• Try a direct letter first when the overlap is clear but the applicant seems unaware.
• File the extension or notice if you need more time, before the original deadline.
• Use proof of use preparation as a reason to keep good records of how and where you use your mark.

Frequently asked questions

Can I oppose if my mark is only pending?

Often yes. Many offices accept an earlier filed application as a basis for opposition, although the outcome may depend on that application proceeding to registration. Check the specific rules of the office involved.

Can I oppose based on use without a registration?

In some systems. The US recognises common law rights from use, and the UK and EU allow certain unregistered rights to support an opposition. These cases usually need stronger evidence, so a registration makes everything easier.

Do I need a lawyer to oppose?

Some offices require a local representative for parties based outside the territory. Even where it is not required, contested cases benefit from professional help. Many owners prepare the facts and evidence themselves and bring in a representative for the filing and arguments.

What does an opposition cost?

Each office charges an official fee, which you can find on its current fee schedule, plus your own costs for preparing the case. Total cost depends heavily on whether the case settles early.

The short version

A similar trademark filed after yours is a time problem first and a legal problem second. Find out the moment it is published, write down the deadline, assess the overlap and act inside the window. A watch on every territory where you sell is the simplest way to make sure you always get that chance. You can run a trademark search on any new filing in Trademarking to see how close it is to your mark, with the source for every result.