What Are Incontestable Trademarks?

Incontestability is a US status with specific conditions

A US trademark does not become incontestable simply because five years have passed. For an eligible Principal Register registration, the owner may claim the benefits of Section 15 by filing a declaration that meets the statutory requirements. Filing is optional. Keeping the registration alive through required maintenance is a separate obligation.

Incontestability can strengthen the owner's legal position, but it does not make the mark immune from cancellation or give the owner absolute rights against everyone. These are US rules, not a five-year rule that can be applied to every country. TMEP section 1605 explains the distinction.

Check eligibility before signing a Section 15 declaration

For an ordinary modern federal registration, check all of the following:

• The mark is registered on the Principal Register. A Supplemental Register registration is not eligible.
• The mark has been in continuous use in commerce for five consecutive years after its US registration date, and it is still in use in commerce for the goods or services included in the claim. Five years from filing, first use, or a foreign registration is not the same calculation.
• There has been no final decision adverse to the owner's claim of ownership, right to register the mark, or right to keep it registered.
• No proceeding involving those rights is pending in the USPTO or a court and not finally disposed of.
• The declaration is filed by the current owner, properly signed, and accompanied by the required fee for the classes covered.

The legal meaning of a proceeding involving those rights can require review. For example, the USPTO does not treat every lawsuit brought by the owner as automatically disqualifying when there is no counterclaim involving the owner's rights. Do not guess how a pending dispute affects the declaration. The detailed conditions appear in TMEP section 1605.04.

When the declaration can be filed

The declaration must be executed and filed within one year after the end of a qualifying five-year period of continuous use following registration. The first possible filing window often coincides with the fifth-to-sixth-year maintenance window, but Section 15 is not restricted to that first anniversary window. A later qualifying five-year period can support a later filing.

If continuous use does not support a Section 15 claim, do not make the claim just to combine it with a maintenance filing. File the required maintenance document on time and assess Section 15 separately. See the USPTO's Section 15 filing instructions.

How to prepare and file

1. Review the registration and ownership record. Confirm the US registration date, Principal Register status, current owner, and exact goods or services.
2. Review the facts behind the declaration. Identify the qualifying period of continuous use and the goods or services for which every required statement is true. A claim does not have to cover every item in the registration. Keep records supporting the statements even though a standalone Section 15 declaration ordinarily does not require specimens.
3. Choose the appropriate current USPTO form. Use the standalone Section 15 declaration or, when the requirements and timing of both filings are met, a combined Sections 8 and 15 declaration. Eligible Madrid-based US registrations use Section 71 for maintenance and may use the combined Sections 71 and 15 form. The official maintenance forms directory currently links these filings to Trademark Center.
4. Have the proper person review and sign the verified statements, pay the applicable per-class fees, and submit. A combined filing must satisfy each component's requirements, including specimens and other information required for its maintenance component. A foreign-domiciled owner generally needs a US-licensed attorney.
5. Save the filing confirmation and review subsequent USPTO correspondence. Check TSDR for the recorded filing and acknowledgment, and respond to any notice within its stated deadline.

The USPTO reviews the declaration for consistency with the statutory and procedural requirements. Its acknowledgment is not a ruling that the registration is incontestable in every future dispute. That issue can be determined by a court. TMEP section 1605.

What incontestability does and does not change

To the extent Section 15 applies, the registration provides conclusive evidence of certain rights, subject to statutory defenses and exceptions. It does not excuse the owner from proving infringement, expand the goods or services, or erase every earlier user's rights. Available defenses can include qualifying prior use, fair use, abandonment and other grounds under 15 USC section 1115(b).

Cancellation can remain available on specified grounds, including genericness, functionality, abandonment and fraud in obtaining the registration. Incontestability is therefore not a promise that no one can challenge the mark. See 15 USC section 1064. There is also a separate rule limiting certain cancellation grounds after a registration has existed for five years. That limitation does not depend on filing a Section 15 declaration. Do not confuse registration age with an incontestability claim. TMEP section 1605.06.

Keep maintenance and renewal on their own calendar

Section 15 does not replace a required Section 8 or Section 71 filing, and it is not a renewal application. A Madrid-based US registration can be eligible for Section 15 under the applicable US rules, but its US maintenance and international renewal obligations remain separate. See the USPTO's Madrid post-registration guidance.

Before filing, have the registration history, use and any disputes reviewed against the current requirements. This guide explains the process generally and does not determine whether a particular registration qualifies.

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