Receiving a trademark refusal from the U.S. Patent and Trademark Office can be frustrating, especially when the refusal claims that your product design or trade dress is “functional.” Many applicants assume that if a design is unique or recognizable, it should qualify for trademark protection. In reality, functionality disputes often come down to one thing: evidence.
When the USPTO issues a functionality refusal, an important legal question arises: who has the burden of proof?
The answer is more nuanced than many business owners realize. In trademark law, the burden can shift between the examining attorney and the applicant depending on the stage of the analysis. Understanding how this process works is essential for businesses pursuing trade dress or product configuration protection.
What Is a Functionality Refusal?
A functionality refusal occurs when the USPTO determines that a proposed trademark is functional rather than source-identifying.
Trademark law protects branding elements that identify the source of goods or services. It does not protect useful product features. If a feature is considered functional, it cannot be registered as a trademark.
Functionality refusals commonly arise in:
- Product design applications
- Trade dress filings
- Product packaging cases
- Product configuration disputes
Because functionality is considered an absolute bar to registration, these refusals are taken very seriously by the USPTO.
If you are unfamiliar with how functionality works generally, Keener Legal’s blog on the functionality doctrine provides additional background on why useful product features cannot receive trademark protection.
Who Has the Initial Burden of Proof?
In a functionality refusal, the examining attorney has the initial burden of proof.
The USPTO must establish what is known as a prima facie case of functionality before maintaining the refusal. This means the examining attorney must provide enough evidence to reasonably support the conclusion that the proposed mark is functional.
Importantly, the refusal cannot be based on speculation or assumptions alone. Courts have repeatedly emphasized that there must be evidentiary support in the record.
This requirement protects applicants from unsupported refusals and ensures that functionality determinations are based on actual facts rather than opinion.
What Is a Prima Facie Case of Functionality?
A prima facie case means the examining attorney has presented sufficient evidence showing that the feature appears functional under trademark law.
To build this case, the USPTO examines:
- The drawing of the proposed mark
- The written description of the mark
- The identification of goods or services
- Specimens submitted with the application
However, the analysis does not stop there.
Examining attorneys are also expected to conduct independent research to support the refusal. This often includes reviewing:
- Utility patents
- Product advertising
- Industry materials
- Product descriptions
- Marketing claims emphasizing utility or performance
If there is reason to believe the mark may be functional but the evidence is incomplete, the examining attorney may issue a request for additional information before formally refusing registration.
What Happens After the USPTO Makes Its Case?
Once the USPTO establishes a prima facie case, the burden shifts to the applicant.
At that stage, the applicant must provide what courts describe as competent evidence to rebut the functionality refusal.
This is a critical point in the process. Simply disagreeing with the refusal is not enough. Applicants must support their position with evidence demonstrating that the proposed mark is not legally functional.
The standard applied is known as the preponderance of evidence standard. In simple terms, the applicant must show that it is more likely than not that the feature is non-functional.
What Counts as Competent Evidence?
Not all evidence carries the same weight in a functionality dispute. Unsupported arguments or conclusory statements are rarely enough to overcome a refusal.
Examples of competent evidence may include:
- Expert testimony
- Evidence of alternative designs
- Marketing materials emphasizing branding instead of utility
- Consumer perception evidence
- Technical evidence showing the feature does not improve function
The goal is to demonstrate that the feature serves primarily as a source identifier rather than a utilitarian product feature.
Strong documentation and a well-developed legal strategy can make a significant difference in these cases.
Why Utility Patents Create Major Problems
One of the strongest forms of evidence supporting functionality is a utility patent.
In TrafFix Devices, Inc. v. Marketing Displays, Inc., the Supreme Court explained that utility patents create a strong inference that the disclosed features are functional.
If a patent specifically describes the utilitarian advantages of a design, the applicant faces an especially heavy burden in trying to prove the feature is non-functional.
This is because patents exist to protect useful inventions. When a patent highlights how a feature improves performance, efficiency, or utility, it becomes difficult to later argue that the same feature serves only as branding.
Applicants in these situations must overcome what courts describe as a “strong evidentiary inference of functionality.”
Why Functionality Determinations Depend on the Totality of Evidence
Functionality determinations are questions of fact. Courts and the USPTO evaluate the totality of the evidence in each individual case.
There is no exact formula or minimum amount of evidence required. Instead, the analysis depends on how all of the evidence fits together.
Factors may include:
- Utility patents
- Advertising claims
- Alternative designs
- Product efficiency
- Manufacturing advantages
- Consumer perception
Because every case is different, functionality disputes are often highly fact-specific.
What Happens If the USPTO Lacks Evidence?
Courts have made it clear that functionality refusals must be supported by evidence.
One important example comes from In re Morton-Norwich Products, Inc., where the court criticized the examining attorney and the Trademark Trial and Appeal Board for failing to provide even “one iota of evidence” supporting the refusal.
This case reinforced an important principle:
The USPTO must support functionality refusals with actual evidence in the record.
Without adequate evidence, a refusal may not stand.
Why Functionality Refusals Are Difficult to Overcome
Although applicants can rebut a functionality refusal, these refusals are often difficult to overcome in practice.
This is because:
- Functionality is an absolute bar to registration
- Utility-focused features are heavily scrutinized
- Patents create strong evidence against registrability
- Consumer recognition alone does not overcome functionality
Even if customers strongly associate a feature with a particular brand, trademark protection will still be denied if the feature is functional.
This is one reason businesses should evaluate functionality risks before filing an application.
How Businesses Can Reduce Functionality Risks
Businesses can reduce the risk of functionality refusals by developing a proactive trademark strategy.
Important steps include:
- Focusing on non-functional branding elements
- Separating utility from visual identity
- Avoiding marketing claims emphasizing utilitarian advantages
- Conducting legal review before filing
- Considering patent protection when functionality is central to the design
These strategies can help businesses pursue stronger and more defensible trademark applications.
How Keener Legal Helps With Functionality Disputes
Functionality disputes can become highly technical and evidence-driven. Determining whether a feature is functional often requires careful legal and strategic analysis.
Keener Legal helps businesses:
- Evaluate functionality risks before filing
- Analyze patents and advertising materials
- Develop evidence strategies
- Respond to Office Actions
- Identify stronger trademark elements
- Build long-term brand protection strategies
Whether you are filing for trade dress protection, product configuration, or packaging design, legal guidance early in the process can help avoid costly refusals later.
Ready to Protect Your Brand?
If you are facing a functionality refusal or preparing to file a trade dress application, Keener Legal can help you evaluate your risks and strengthen your trademark strategy.
Contact Keener Legal today to determine whether your proposed mark is protectable before investing time and money into the filing process.
You may also find these related articles helpful:
- What Is the Functionality Doctrine in Trademark Law?
- Can Trade Dress Be Protected as a Trademark?
- Why Can’t Functional Matter Be Trademarked?
- What Is a Functionality Refusal in Trademark Law?
Final Thoughts on Burden of Proof in Functionality Refusals
In a functionality refusal, the burden of proof begins with the USPTO. The examining attorney must establish a prima facie case supported by evidence showing that the proposed mark is functional.
Once that happens, the burden shifts to the applicant to rebut the refusal with competent evidence.
Because these disputes depend heavily on factual analysis and evidentiary support, businesses should approach functionality issues carefully before filing. Understanding how the burden-shifting process works can help applicants build stronger trademark strategies and avoid unnecessary refusals.
