Design patent litigation often appears deceptively simple. Unlike utility patents, the claim is usually expressed through drawings rather than paragraphs of technical language. Yet that simplicity raises a difficult question: when a patent claim is primarily visual, who should determine its scope? 

The answer sits at the center of a growing debate within design patent law. Recent opinions involving Range of Motion v. Armaid bring that debate into sharp focus and force courts, litigants, and practitioners to reconsider how visual property rights should be interpreted and enforced. 

A Different Kind of Claim 

Most patent lawyers spend their careers analyzing words. 

Claim construction traditionally involves determining the meaning of written claim language. Courts interpret terms, review specifications, examine prosecution history, and establish authoritative boundaries that apply throughout a case. 

Design patents are different. The claim is largely the drawing itself. The question is no longer what a phrase means but what visual impression a design creates and which elements are disclaimed. 

That distinction may sound subtle, but it changes the entire nature of the dispute. 

A judge interpreting the meaning of a written term is performing a familiar legal function. A judge evaluating the visual significance of a contour, shape, or arrangement may be engaged in something far closer to perception than interpretation. 

The Debate Behind Range of Motion

The disagreement reflected in the opinions surrounding Range of Motion is not merely about infringement. It is about institutional competence. 

One view emphasizes the importance of judicial guidance. Under this approach, courts identify legal boundaries, clarify drawing conventions, address functionality, and provide the framework within which infringement comparisons occur. The judge marks the trail, and the jury follows it. 

The competing view starts from a different premise. If the claim is fundamentally visual and the disputed issues depend heavily on evidence concerning function, design alternatives, and consumer perception, why assume judges are uniquely suited to make those determinations? Under this model, juries play a larger role in evaluating overall visual impression and infringement. 

Both approaches seek consistency. They simply disagree about how that consistency should be achieved. 

The Translation Problem 

The central challenge in design patent litigation may be described as a translation problem. 

Courts naturally attempt to explain visual designs in words. But every verbal description changes the way the design is perceived. A judge may describe a design using a general concept, a list of features, a discussion of functionality, or a detailed verbal characterization of its appearance. Each additional layer of language focuses attention on some aspects of the design while minimizing others. 

Eventually, the explanation can begin to replace the image itself. 

The critical question is not whether courts should use words. Some explanation is indispensable. The question is how much explanation remains helpful before it starts altering the object being compared. 

Why Functionality Creates Additional Complexity 

Functionality further complicates the analysis. 

Design patents protect ornamental appearance, not functional concepts. Yet many product features serve both purposes simultaneously. A handle, for example, performs a practical function. At the same time, its shape, placement, proportions, and integration into the overall design contribute to visual appearance. 

The challenge is separating the abstract functional idea from the particular manner in which that idea is visually expressed. 

Some observers worry that aggressive functionality analysis risks eliminating important visual features from consideration altogether. Others see functionality as an essential tool for preventing design patents from giving owners control over useful product concepts rather than ornamental expression. 

Neither concern can be dismissed lightly. 

The Importance of Context 

Another lesson from recent design patent disputes is that comparisons rarely occur in isolation. 

The patented design and accused product form part of the analysis, but prior art frequently supplies the context that gives visual differences their significance. A small variation may appear trivial in one environment and highly important in another depending on what already exists in the field. 

That contextual role explains why debates continue regarding how often prior art should be incorporated into infringement comparisons and when courts may resolve cases without undertaking a more complete analysis. 

What Litigators Should Do Now 

Regardless of where courts eventually settle these questions, several practical lessons are already apparent. 

First, claim construction should explain the drawings without substituting a verbal claim for the images themselves. Second, functionality arguments should distinguish between a product's purpose and the specific appearance used to implement that purpose. Third, summary judgment presentations should address both direct visual comparisons and context supplied by relevant prior art. Finally, demonstratives should maintain consistent scale, orientation, and context so that presentation choices do not distort the comparison being made. 

The Real Question 

The most important lesson from Range of Motion may be methodological rather than doctrinal. 

Too often, participants ask who should decide an issue before identifying what kind of issue it actually is. Some questions are legal. Some are factual. Some involve visual judgment. Others contain elements of all three. 

Careful characterization should come before allocation. 

Once courts distinguish legal boundaries from factual evidence and perceptual judgments, the proper role of judges and juries becomes easier to identify. That approach offers a more productive framework than treating every disputed issue as a single category called “claim construction.” 

For design patents, the future debate is unlikely to focus solely on who decides. The more important question may be what remains for the decision maker to decide once the legal framework has been established.