Patent vs Registered Design: What's the Difference?

A patent protects how an invention works. A registered design (called a "design patent" in the US) protects how it looks. They are complementary forms of protection — and for physical product inventors, filing both is often the strongest strategy.

The Core Distinction

Patent (utility patent / invention patent): Protects function — the mechanism, structure, process, or composition that makes the invention work. The claims define the scope of protection. A competitor who uses a different-looking product that works the same way infringes the patent.

Registered design (design patent): Protects appearance — the visual features of a product, including its shape, contours, colours, texture, and ornamentation. The drawings define the scope of protection. A competitor who makes a product that works differently but looks substantially the same infringes the design.

A novel bottle cap with a unique sealing mechanism could be protected by a utility patent covering the sealing mechanism and a design registration covering the distinctive shape. A competitor who copies the mechanism but changes the shape infringes the patent. A competitor who copies the shape but uses a different mechanism infringes the design. Together, the protections cover both angles.

Side-by-Side Comparison

Why File Both

The strongest IP position for a physical product combines both protections. Each covers what the other misses:

A competitor who redesigns the appearance to avoid the registered design may still infringe the utility patent — if they kept the same functional mechanism. A competitor who redesigns the mechanism to avoid the utility patent may still infringe the registered design — if they kept the same visual appearance.

For consumer products where both the look and the technology matter, dual protection creates a much harder design-around challenge for competitors.

Speed and Cost Advantages of Design Protection

Design protection is dramatically faster and cheaper than utility patent protection. An EU registered design can be obtained in weeks for a few hundred euros. A US design patent takes 12–18 months and costs a few thousand dollars. Both are significantly faster and cheaper than a utility patent.

This makes design protection a practical first line of defence for inventors who cannot yet afford full utility patent prosecution, or who need immediate rights while a utility patent application is pending.

The Hague Agreement

The Hague Agreement allows inventors to file a single international design application covering up to 90+ countries — the design equivalent of the PCT for utility patents. A single application, filed through WIPO, can designate the EU, US, Japan, South Korea, and many other jurisdictions simultaneously.

For inventors with global distribution, the Hague system is a cost-effective way to secure design protection across major markets in one filing.

Limitations of Design Protection

Design protection covers only the specific appearance as registered. Competitors can often create visually similar products with modest changes — altering proportions, contours, or surface treatment enough to avoid the "overall impression" infringement test. The scope of design protection is inherently narrower than a well-drafted utility patent.

Design protection also does not cover functional features. If the appearance of a product is entirely dictated by its technical function — it cannot look any other way and still work — it cannot be protected as a design.

Sources

1. 35 U.S.C. § 171 — Design Patents — US statutory basis for design patent protection
2. WIPO Hague System for Industrial Designs — International registration system for industrial designs
3. EUIPO Registered Community Design — EU design registration system for protecting ornamental appearance