What Is an Incontestable Trademark? (Section 15 Explained)
Incontestability is one of the strongest positions a U.S. trademark owner can reach. After five years of continuous use, a federally registered mark can become "incontestable" — sharply limiting how competitors can challenge it. Here is what that status means, how you claim it, and where its limits lie.
Free Trademark Search →What does "incontestable" actually mean?
Incontestable status means your federal registration becomes conclusive legal evidence of your exclusive nationwide right to use the mark on the goods or services listed. In practical terms, a competitor can no longer wipe out your registration simply by arguing the mark is "merely descriptive," or that they used a similar name first in a limited area. It is the difference between a registration a rival can pick apart and one that stands as settled proof of your rights. Incontestability flows from Section 15 of the Lanham Act (15 U.S.C. §1065) and applies only to marks registered on the Principal Register.
How do you make a trademark incontestable?
You file a Section 15 Declaration of Incontestability with the USPTO once the mark has been in continuous use in commerce for five straight years after registration and is still in use. Most owners file it together with the required Section 8 Declaration of Use between the fifth and sixth anniversary of registration — a combined "Sections 8 & 15" filing. The declaration must confirm there is no pending challenge to the mark and no final decision against the owner's rights. The USPTO charges its own per-class government fee for the declaration, separate from the original application fee, and the status is never granted automatically.
What are the limits of incontestability?
Incontestable does not mean invincible. A registration can still be cancelled or challenged if the mark becomes generic, is functional, was abandoned through non-use, was obtained by fraud, or is being used to misrepresent the source of goods. Certain defenses — such as fair use and prior use in a specific geographic area — also survive. Incontestability closes the most common attacks, but ongoing use, brand monitoring, and timely maintenance filings are what keep a registration strong over time.
Ready to build a registration worth protecting?
A federal trademark registration filed with the USPTO turns your brand name into protected intellectual property — the foundation of lasting brand protection. Incontestability rewards owners who file early and use their mark consistently, so Secure Mark USA makes that first step simple.
Start Your RegistrationKey takeaways
- Incontestability requires five consecutive years of continuous use after federal registration on the Principal Register.
- It is claimed by filing a Section 15 declaration, usually combined with the Section 8 Declaration of Use.
- Incontestable status is conclusive evidence of the owner's exclusive right to use the mark.
- A mark can still be cancelled if it becomes generic, is abandoned, or was obtained by fraud.
- Secure Mark USA files new trademark applications from $99 plus the $350-per-class USPTO fee.
Frequently asked questions
How long until my trademark can become incontestable?
Five consecutive years of continuous use in commerce after the registration date, provided the mark is still in use and has faced no final adverse decision on the owner's rights.
Is filing a Section 15 declaration required?
No. Incontestability is optional. However, a Section 8 Declaration of Use between years five and six is required to keep the registration alive, so many owners file both together as a combined Sections 8 and 15 declaration.
Can an incontestable trademark still be cancelled?
Yes, on limited grounds such as the mark becoming generic, abandonment, fraud in obtaining the registration, or functionality. Incontestability blocks the common "merely descriptive" attack but not these.
Does incontestability apply to Supplemental Register marks?
No. Only marks on the Principal Register are eligible. Registrations on the Supplemental Register cannot become incontestable.
Can Secure Mark USA give me legal advice about incontestability?
Secure Mark USA is a private trademark filing service, not a law firm, and does not provide legal advice. We prepare and file your paperwork accurately; for legal strategy you may consult a licensed attorney.
Helpful resources
Trademark Registration · Section 8 & 9 Maintenance Deadlines · Principal vs. Supplemental Register · Trademark Renewals · Free Trademark Search
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