Design Patent Infringement: 5 Proven Ways to Win

A design patent can be one of the most powerful assets a product company owns. It is also one of the most misunderstood when disputes start. Unlike a utility patent, there are no claim limitations to parse word by word — the drawings are the claim, and the fight is almost entirely visual. Proving design patent infringement comes down to how one ordinary observer would see two designs side by side, and the damages can reach an infringer’s total profit. Here is how these cases are actually won, and the five moves that decide them.

What Counts as Design Patent Infringement

A design patent protects the ornamental appearance of an article of manufacture, not its function. Infringement happens when someone makes, uses, sells, or imports a product whose appearance is substantially the same as the patented design, without permission, under 35 U.S.C. § 271. Because the drawings define the protected design, everything turns on what those figures show — including which lines are solid (claimed) and which are broken (unclaimed context).

That single distinction decides many cases before they reach a jury. Solid lines are the design you own; broken lines merely show environment and are disclaimed. Getting the drawings right at filing is therefore not a formality — it is the difference between a claim that catches close copies and one that a competitor can design around. It is why we treat design patent drawings as a strategic exercise, not a clerical one.

The Ordinary Observer Test Explained

The governing standard comes from an 1871 Supreme Court case, Gorham Co. v. White, and it still controls today. The test asks whether an ordinary observer, giving the attention a normal purchaser gives, would be deceived into thinking the accused design is the patented one — in short, are the two designs substantially the same in overall appearance?

The observer is a buyer of that kind of product, not an expert and not a casual passerby. The comparison is holistic: you weigh the overall visual impression, not a checklist of individual features. Minor differences that a real purchaser would not notice do not avoid liability, and matching some features while differing on trivial ones does not create it.

• Compare the whole design as a purchaser would see it, not feature by feature.
• Judge from the standpoint of an ordinary observer familiar with similar products.
• Ask whether the resemblance would deceive that observer into buying one thinking it was the other.
• Ignore functional elements — only ornamental appearance is protected.

Why Prior Art Decides Close Cases

In its 2008 en banc decision Egyptian Goddess, Inc. v. Swisa, Inc., the Federal Circuit refined how the ordinary observer test works and eliminated the separate “point of novelty” test that challengers had used for years. The court held that the ordinary observer must view the two designs in the context of the prior art.

That context is decisive. When the field is crowded with similar prior designs, an ordinary observer familiar with that art notices small differences, so the patented design’s protection is narrow and only near-identical copies infringe. When the design is a departure from anything that came before, the same observer reads the two designs as the same more readily, and protection is broad. Before you assert a design patent, map the prior art — it tells you how wide your claim really is. A focused prior-art search often reframes the whole dispute.

In practice, this becomes a three-way visual comparison: the patented design, the accused product, and the closest prior art, all viewed together. Where the accused product is closer to the prior art than to the patent, there is no infringement. Where it is closer to the patent, and the two share features that set the patent apart from the prior art, the case for infringement is strong. Building that three-way exhibit early — with clean, comparable images — is often the single most persuasive piece of work in the entire dispute.

Damages: Total Profit Under Section 289

Design patents carry a remedy no utility patent offers. Under 35 U.S.C. § 289, an infringer is liable for its total profit on the article of manufacture, but not less than $250. There is no need to prove a reasonable royalty or apportion value — the statute hands the design owner the infringer’s entire profit on the relevant article.

The stakes of that rule drove Samsung Electronics Co. v. Apple Inc. to the Supreme Court. A jury had awarded Apple roughly $399 million — Samsung’s whole profit on the infringing phones. In 2016, the Court held that the “article of manufacture” can be the entire product or just a component of it, so total profit is not automatically the profit on the finished product. The case was sent back to decide which article the design covers. For a phone, that might be the front face or the screen, not the whole device.

The practical lesson: identifying the correct article of manufacture is now the central damages battle in multi-component products. A design owner argues for the largest sensible article; an accused infringer argues for the smallest. As an alternative or supplement, a patentee can still seek damages under 35 U.S.C. § 284 (a reasonable royalty or lost profits), but § 289’s total-profit remedy is usually the bigger hammer.

5 Proven Ways to Win a Design Patent Case

1. Get the drawings right first. Solid versus broken lines set your claim scope. Precise figures at filing decide whether you catch close copies later.
2. Frame the overall visual impression. Argue the design as a whole; do not let the other side reduce it to a list of individual features.
3. Master the prior art. It sets how broad or narrow your protection is and defends against an invalidity counterattack.
4. Nail the article of manufacture. On multi-part products, this single question can swing damages by orders of magnitude under Section 289.
5. Pressure-test validity early. After the 2024 LKQ v. GM ruling, design patents are easier to challenge for obviousness, so confirm your patent holds up before you sue.

Before You Send a Cease-and-Desist

Enforcement is leverage, but only if the asset is solid. Two questions come first. Is the accused product substantially the same as your design in the eyes of an ordinary observer familiar with the prior art? And will your patent survive an obviousness challenge under the newer, tougher standard?

That second question is more pressing than it used to be. As we explain in our guide to design patent obviousness, the Federal Circuit’s LKQ decision lowered the bar for invalidating design patents, so a defendant’s first move is often to attack validity rather than dispute copying. Confirm both infringement and durability before you spend on litigation, and you negotiate from strength instead of hope.

Remedies go beyond money. A design owner can seek an injunction to stop sales, and for imported goods, an exclusion order from the U.S. International Trade Commission can block infringing products at the border — often faster and more disruptive to a competitor than a district-court judgment. Choosing the right forum and remedy is a strategic decision, not an afterthought. The strongest campaigns line up the validity analysis, the infringement read, and the damages theory before the first demand letter goes out.

How PerspireIP Can Help

From USPTO-compliant design drawings that define enforceable scope to prior-art and invalidity searches that stress-test both sides of a dispute, PerspireIP gives design owners and accused infringers the analysis these cases turn on. Contact our team to evaluate a design patent infringement matter.

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