Kimble v. Marvel Entertainment, LLC
The Court refused to overturn a 1964 ruling that bars inventors from collecting royalty payments on their patents after those patents expire, even though the toy inventor asking for the change offered a plausible economic argument against the old rule.
The decision means licensing deals that promise royalties past a patent's 20-year term remain unenforceable for the post-expiration period, and it signals that the Court will leave major changes to patent policy to Congress rather than rewrite the rules itself.
“Respecting stare decisis means sticking to some wrong decisions.”
Explaining why the Court adheres to precedent even if it might be mistaken.
How it got here: A federal district court ruled for Marvel that royalties ended when the patent expired; the Ninth Circuit affirmed; Kimble asked the Supreme Court to overrule the underlying precedent.
The Case in Depth
What happened
Stephen Kimble patented a toy that let kids shoot foam string like Spider-Man. After a dispute with Marvel over an unpaid, similar toy, the parties settled: Marvel would pay Kimble a lump sum plus a 3% royalty on future sales, with no end date specified. Years later Marvel discovered a 1964 Supreme Court case, Brulotte v. Thys Co., holding that royalties can't be collected after a patent expires, and stopped paying once Kimble's patent lapsed.
The question before the Court
Should the Supreme Court overturn its old rule that inventors can't keep collecting patent royalties after the patent expires?
The Court's answer
No — the Court declined to overrule Brulotte v. Thys Co. and left the 1964 rule barring post-expiration patent royalties in place. The Court's reasoning centered on stare decisis, the principle that courts should generally stick with prior decisions rather than revisit them just because a majority today might decide differently.
Because Brulotte interpreted a federal statute, Congress — not the Court — is the proper body to change it if the rule is bad policy, and Congress has repeatedly declined to do so despite chances to act. The Court also found Brulotte's rule simple to apply, not eroded by later developments, and tied to property and contract expectations that deserve extra protection, so Kimble's economic arguments, even if sound, weren't enough to clear the high bar for overruling precedent.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Businesses and inventors negotiating patent licenses must structure deals knowing royalties can't legally run past the patent's expiration — they'll need workarounds like deferred payments, multi-patent deals, or non-royalty arrangements. Anyone with an existing royalty agreement tied to an expired patent can stop paying once the patent lapses, as Marvel did here.
What changes now
This is a final merits decision, not a remand for further proceedings on the substantive question — Brulotte remains binding law, and Marvel need not resume paying royalties on Kimble's expired patent. Parties negotiating patent licenses must continue structuring deals to avoid post-expiration royalty provisions. Any change to the rule would have to come from Congress amending the patent statute, something the opinion notes Congress has repeatedly declined to do.
What this does not decide
The Court did not decide whether Brulotte's economic reasoning is actually correct — it accepted Kimble's critique might have merit but ruled that being possibly wrong isn't enough to overturn a statutory precedent. The decision leaves open various workarounds parties can still use, like deferring payments or tying royalties to non-patent rights.
Concurrences and dissents
Dissent — Justice Alito
“The Court employs stare decisis, normally a tool of restraint, to reaffirm a clear case of judicial overreach.”The dissent's core objection that the majority misused stare decisis to preserve a flawed ruling.
Justice Alito, joined by the Chief Justice and Justice Thomas, argued Brulotte was never really statutory interpretation but pure economic policymaking with no textual basis in the Patent Act, and that its underlying economic reasoning has since been thoroughly discredited. He would give it less stare decisis protection because it's a judge-made rule masquerading as statutory interpretation, would find it has disrupted rather than protected contractual expectations (as this very case shows), and would overrule it as an unjustified judicial error that stifles innovation.
How the Court got there
The legal reasoning, step by step
- The Court applied the doctrine of stare decisis — the idea that courts should generally stand by prior decisions rather than revisit them just because they might be decided differently today — and required a 'special justification' beyond a belief that the earlier case was wrong before overruling it.
- Because the 1964 decision, Brulotte, interpreted a federal statute rather than the Constitution, the Court treated it as carrying extra weight: Congress can fix statutory rulings it dislikes, and Congress had repeatedly amended patent law without touching Brulotte's rule, even rejecting bills that would have replaced it with the approach Kimble wanted.
- The Court noted that Brulotte sits in the areas of property and contract law, where reliance on settled precedent is especially strong, since businesses may have structured licensing deals assuming the rule would apply.
- Turning to the traditional reasons courts do abandon precedent, the Court found neither applied here: the legal foundation of Brulotte had not eroded over time, and the rule remained simple and predictable to apply compared to the case-by-case antitrust-style test Kimble proposed.
- The Court accepted that Kimble's economic critique of Brulotte might be correct but held that a bare claim the prior Court miscalculated the economics isn't the kind of 'special justification' needed to overrule precedent, especially since patent law, unlike antitrust law, doesn't give courts ongoing authority to update the rule as economic understanding evolves.
- Concluding that no special justification for departing from precedent existed, the Court left Brulotte's per se bar on post-expiration patent royalties intact.
Doctrinal impact
Cases affected by this decision
Reaffirms Brulotte v. Thys Co. (379 U. S. 29)
The Court declined to overrule Brulotte's ban on post-patent-expiration royalties, leaving it fully intact.
Reaffirms Scott Paper Co. v. Marcalus Mfg. Co. (326 U. S. 249)
Cited as still-good law underlying Brulotte's rule against restricting free use of expired patents.