Design Patent Expiration: How the Rules Differ

When most people think about patent expiration, they're thinking about utility patents. But design patents have their own rules, and they're meaningfully different.

If you're tracking when a design patent expires, or trying to understand what protections a product has, it helps to understand how design patent terms work.

The basic term: 15 years from grant

For design patents filed on or after May 13, 2015, the term is 15 years from the date of grant. This is different from utility patents in two ways:

1. The clock starts at grant, not at the filing date
2. The term is 15 years, not 20

Before May 13, 2015, design patents had a 14-year term from grant. That change happened when the US implemented the Hague Agreement, aligning US design patent terms with international norms.

So if you're looking at an older design patent, check the grant date. If it was granted before May 2015, the term is 14 years. If after, it's 15.

No maintenance fees

Utility patents require maintenance fee payments at 3.5, 7.5, and 11.5 years after grant. Design patents have no maintenance fees. Once issued, a design patent runs its full term without any renewal obligation.

This makes design patent expiration simpler to calculate. There's no need to check fee payment status.

No patent term adjustment

PTA compensates utility patent owners for USPTO prosecution delays. Design patents are not eligible for PTA. The term is fixed at 14 or 15 years from grant, full stop.

No patent term extension

PTE under Section 156 applies to patents on products requiring FDA regulatory review, primarily pharmaceuticals. Design patents are not eligible for PTE either.

How to calculate design patent expiration

The math is straightforward:

1. Find the grant date on the patent's cover page
2. If the grant date is on or after May 13, 2015, add 15 years
3. If the grant date is before May 13, 2015, add 14 years

That's the expiration date, with no adjustments needed.

What design patents actually protect

Design patents protect the ornamental appearance of a product, not its function. The classic example is the shape of a Coca-Cola bottle or the specific visual design of a product's interface. If someone makes a product that looks substantially similar to the design patent's drawings, they may be infringing.

This is separate from trade dress and copyright, which can sometimes provide overlapping or longer-lasting protection for product designs.

When a design patent expires, the specific ornamental design claimed enters the public domain. Competitors can then make products with that same visual appearance, though trademark and trade dress protections may still apply if the design has become associated with a particular brand.

Design patents and utilities for the same product

Many products are protected by both design and utility patents simultaneously. A smartphone might have utility patents covering its internal technology and design patents covering its screen shape, icon layout, or physical form.

The utility and design patents will expire at different times using different rules. It's worth tracking them separately if you're doing a comprehensive freedom-to-operate analysis.

A practical example

A design patent granted on October 1, 2018 (after the May 2015 cutoff) expires on October 1, 2033. The math: 2018 + 15 = 2033. No maintenance fees to check, no PTA to calculate.

A design patent granted on June 1, 2010 (before the May 2015 cutoff) expires on June 1, 2024. The math: 2010 + 14 = 2024. That patent has already expired.

The Patent Sunset calculator handles both design and utility patents, applying the correct term rules based on grant date and patent type.