A design patent protects the way a manufactured article looks — its ornamental appearance — rather than how it works. The authority is short and specific. Section 171(a) of Title 35 of the U.S. Code provides that "Whoever invents any new, original and ornamental design for an article of manufacture may obtain a patent therefor, subject to the conditions and requirements of this title." Three words in that sentence do the work: the design must be new, original, and ornamental, and it must be a design for an article of manufacture — not a free-floating drawing and not a functional mechanism.

That last point is the line that separates design patents from utility patents, and it is the most common source of confusion in consumer-device coverage. A utility patent (the subject of 35 U.S.C. § 101) protects how an invention is built or operates — a new circuit, a sensor arrangement, an algorithm. A design patent protects only appearance. The USPTO's Manual of Patent Examining Procedure (MPEP) § 1502 states the rule directly, drawing on In re Zahn: a design is the visual characteristics embodied in or applied to an article, and it cannot exist on its own.

"The design for an article consists of the visual characteristics embodied in or applied to an article. Since a design is manifested in appearance, the subject matter of a design patent application may relate to the configuration or shape of an article, to the surface ornamentation applied to an article, or to the combination of configuration and surface ornamentation. Design is inseparable from the article to which it is applied and cannot exist alone merely as a scheme of surface ornamentation."— MPEP § 1502, source

What the claim actually is: the drawings

A design patent reads differently from a utility patent in one structural way that matters for anyone trying to assess scope. A utility patent contains numbered claims written in words, and its scope is what those words recite. A design patent contains a single claim, and that claim is defined almost entirely by the drawings. The claim language is formulaic — it refers to "the ornamental design for [the article] as shown and described" — and the figures, with their solid and broken lines, carry the legal weight. Solid lines show what is claimed; broken (dashed) lines show environment or unclaimed portions. To understand what a design patent covers, you read the figures, not a paragraph of limitations.

Because the appearance is the invention, ornamentality is a threshold requirement rather than a stylistic nicety. Section 171 makes "ornamental" an element of patentability, and the MPEP elaborates that a design dictated solely by function — where the appearance is the only way the article can work — is not the proper subject of a design patent. In practice this means a design patent on a consumer device protects the chosen, non-dictated visual form: the silhouette of a phone, the layout of a watch face, the contour of an earbud, the pattern of a speaker grille. The functional internals that make those products operate are the province of utility patents.

How design patents fit the consumer-device record

Section 171 also tells you that, with limited exceptions, the rest of patent law applies to designs. Subsection (b) states that "the provisions of this title relating to patents for inventions shall apply to patents for designs, except as otherwise provided." That single sentence imports the familiar machinery: a design must be novel and non-obvious, it is examined, it can be cited as prior art, it can be asserted in litigation, and it can be the basis for an exclusion order at the International Trade Commission. The exceptions are narrow but real — most notably the term, which for designs is set separately by 35 U.S.C. § 173 rather than by the 20-year utility-patent term.

For consumer electronics specifically, design patents are a distinct and heavily used layer of protection precisely because so much product value lives in appearance. The shape of a device, the arrangement of its display elements, and the look of an on-screen graphical user interface can each be the subject of a design patent (the USPTO accepts designs for computer-generated icons and GUIs as applied to a display). When coverage describes a company "patenting the look" of a product, the accurate frame is a design patent under § 171 — a granted right, defined by drawings, that protects the ornamental appearance of an identified article of manufacture and nothing more.

The practical takeaways follow from the statute. A design patent does not stop a competitor from building a device that works the same way; it stops a competitor from making, using, selling, or importing an article whose appearance is substantially the same as the patented design in the eyes of an ordinary observer. Its scope begins and ends with what the drawings show. And it is, in the words of the statute, available only for a design that is at once new, original, and ornamental, applied to a real article of manufacture — the three conditions that define the entire category.

Design and utility patents are layers, not substitutes

One more point keeps the category in proportion: design and utility patents are not alternatives a company must choose between. A single product routinely carries both. The internal sensor arrangement, signal processing, and connectivity that make a wearable function are protected, if at all, by utility patents under 35 U.S.C. § 101; the contour of its case, the layout of its on-screen interface, and the look of its band are protected, if at all, by design patents under § 171. Because § 171(b) imports the rest of Title 35 — novelty under § 102, non-obviousness under § 103, the examination process, and the right to exclude under § 154 — a design patent is a full patent right, not a lesser registration. It is simply a patent whose claimed subject matter is appearance, whose claim is its drawings, and whose term, set by § 173, runs 15 years from grant rather than the 20-years-from-filing term that governs utility patents. Read that way, "what is a design patent" has a clean answer: a granted, examinable, enforceable right in the ornamental look of an identified article of manufacture, defined by figures and bounded by the three words of § 171.