Design Patent Obviousness: 5 Essential Post-LKQ Rules

For nearly forty years, invalidating a design patent for obviousness meant clearing a deliberately high bar. That bar is gone. In its May 2024 en banc decision in LKQ Corp. v. GM Global Technology Operations LLC, the Federal Circuit scrapped the rigid Rosen-Durling test and put design patent obviousness under the same flexible framework that governs utility patents. If you own design patents, enforce them, or challenge them, the ground shifted under your feet. Here is what actually changed, and the five rules that now decide these disputes.

How Design Patent Obviousness Works After LKQ v. GM

A design patent protects the ornamental appearance of an article, not how it works. To be valid, that appearance still has to be new (35 U.S.C. § 102) and nonobvious under 35 U.S.C. § 103. The question in an obviousness attack is simple to state and hard to apply: would the overall visual impression of the claimed design have been obvious to an ordinary designer, given what already existed?

Before 2024, courts answered that with the Rosen-Durling test. A challenger first had to find a single prior-art reference that was “basically the same” as the claimed design (a Rosen reference). Only then could secondary references be added, and only if they were “so related” that a designer would have thought to combine them. In practice, if no single reference looked almost identical to the patented design, the analysis stopped before it started. Many weak designs survived on that technicality.

LKQ ended that. The full court held the same conditions for patentability apply to designs and utility inventions alike, and that design patent obviousness is now governed by the four-part framework from Graham v. John Deere Co., applied with the flexibility the Supreme Court demanded for utility patents in KSR v. Teleflex. The rigid gatekeeping thresholds are gone.

The New Graham-Based Test, Step by Step

The court mapped the classic Graham factors onto ornamental designs. Walk through them in order:

1. Scope and content of the prior art. Identify what came before. The prior art must be analogous, but a design need no longer be “basically the same” to count. The court expressly declined to draw the precise boundaries of analogous art for designs, leaving that to develop case by case.
2. Differences between the prior art and the claimed design. Compare the two visually, from the perspective of an ordinary designer in the relevant field, focusing on the design as a whole rather than isolated features.
3. Level of ordinary skill. Judge the design through the eyes of a designer of ordinary skill who works on articles of that type.
4. Secondary considerations. Objective evidence — commercial success, copying, industry praise — still counts, though the court noted some factors used for utility patents may not map neatly onto designs.

When a single primary reference does not make the design obvious on its own, a challenger can combine references, but only with a record-supported reason, free of hindsight, that an ordinary designer would have done so to arrive at the same overall appearance. That last guardrail is what keeps the new test from collapsing into pure hindsight.

Why the Rosen-Durling Reversal Matters for Your Portfolio

The practical effect is a lower wall for challengers and more exposure for owners. Under the old test, a defendant or petitioner often could not even assemble a prima facie case because no single reference was close enough. Now they can build one from a broader field of prior art, the way utility-patent challengers always have.

Expect this to show up first at the Patent Trial and Appeal Board. Design patents drew relatively few post-grant petitions in part because Rosen-Durling made obviousness so hard to prove. With that barrier removed, invalidity challenges — in inter partes review, in district court, and in ITC actions — become a more realistic threat. The USPTO issued examiner guidance in 2024 to align examination with the new standard, so the shift reaches prosecution as well, not just litigation.

If your competitive position leans on a handful of broad design patents, a fresh look is worth the cost. A pre-suit invalidity review under the new standard tells you whether an asset will hold up before you spend six figures asserting it.

5 Rules That Now Decide These Disputes

1. Overall impression wins, not a feature checklist. The test looks at the design as a whole. Cherry-picking one prior-art feature at a time is hindsight and will be rejected.
2. Analogous art is broader than before. Prior art no longer has to be nearly identical. Assume a wider universe of references is now fair game against your design.
3. Combinations need a real, articulated reason. A challenger must explain, on the record and without hindsight, why an ordinary designer would combine references to reach the claimed look.
4. Secondary considerations still carry weight. Evidence of commercial success, deliberate copying, and industry praise can rebut an obviousness case — gather it early.
5. Prosecution strategy should change. File tighter, well-illustrated claims and consider multiple designs or continuations to build depth rather than betting everything on one broad patent.

What Design Patent Owners Should Do Now

Start with an honest audit. Which of your registered designs are close to known prior art under the broader analogous-art standard? Those are your weak links, and they are the ones a defendant will target first. Rank them by commercial importance, then by obviousness risk.

On the filing side, quality of drawings matters more than ever. Because the test turns on overall visual impression, precise, consistent, and well-chosen views control the scope you actually own. Sloppy or ambiguous drawings hand challengers room to argue. Clean drawings that clearly capture the ornamental features you care about are the cheapest insurance in the whole process — our team handles design patent drawings that meet USPTO requirements and protect claim scope.

Finally, think in families. A single broad design patent is now a single point of failure. Multiple related applications, embodiments, and continuations spread the risk and force a challenger to defeat several assets instead of one. If you are weighing design versus utility protection for the same product, our guide on design patents vs. utility patents lays out the trade-offs.

What Challengers and Defendants Gain

If you have been accused of infringing a design patent, the new standard is an opening. Assets that once looked untouchable may be vulnerable to an obviousness attack built from a wider pool of prior art. The move is to run a targeted invalidity search under the LKQ framework before you settle or spend heavily on a redesign.

That search should map the field of analogous designs, document the ordinary designer’s viewpoint, and build a hindsight-free rationale for any combination of references. Done well, it produces leverage in negotiation or a real path to invalidation at the PTAB. Our patent invalidation search process is built for exactly this kind of prior-art development.

Timing matters too. In inter partes review the petitioner carries the burden by a preponderance of the evidence, a friendlier standard than the clear-and-convincing proof required to invalidate a patent in district court. For an accused infringer, that difference can make the PTAB the better forum for an obviousness challenge under the new framework. Weigh the estoppel consequences before you file, but do not overlook the option.

One caution: the reversal cuts both ways in enforcement. A design patent that clears the tougher new obviousness bar is, if anything, more credible in front of a jury than one that only ever faced Rosen-Durling. Owners who proactively stress-test their key assets and fix or refile the weak ones come out of this shift stronger, not weaker.

How PerspireIP Can Help

Whether you are strengthening a design portfolio against the new obviousness standard or challenging a competitor’s registration, PerspireIP delivers the prior-art searches, invalidity analyses, and USPTO-compliant design drawings that decide these cases. Talk to our team about a post-LKQ review of your designs.

Frequently Asked Questions