Global-Tech Appliances, Inc. v. SEB S. A.
The Court ruled that a company can be held liable for encouraging others to sell a product that infringes a patent even without hard proof it knew of the patent, if it deliberately avoided learning about a patent it strongly suspected existed.
The ruling imports the criminal-law concept of 'willful blindness' into patent law, meaning companies that copy competitors' products and take steps to avoid confirming a patent exists cannot use their self-imposed ignorance as a shield.
How it got here: A jury found Pentalpha liable for induced patent infringement; the district court and the Federal Circuit both upheld the verdict, and Pentalpha asked the Supreme Court to review the knowledge standard.
The Case in Depth
What happened
SEB, a French appliance maker, patented a cool-touch home deep fryer and sold it successfully in the U.S. under the T-Fal brand. Pentalpha, a Hong Kong manufacturer, bought an SEB fryer overseas (without U.S. patent markings), copied its design, and supplied lookalike fryers to Sunbeam and other U.S. retailers, who resold them under their own brands, undercutting SEB's prices.
The question before the Court
If a company copies a competitor's patented product without knowing about the patent, can it still be held liable for pushing others to sell it?
The Court's answer
Yes — a company can be held liable for inducing patent infringement even without direct proof it knew of the patent, if it was willfully blind to that fact. The Court held that the inducement statute requires knowledge that the induced acts amount to patent infringement, rejecting the lower court's looser standard that allowed liability based on mere "deliberate indifference" to a known risk.
But the Court found a middle path: willful blindness — where someone subjectively believes there's a high probability a patent exists and deliberately avoids confirming it — counts as the functional equivalent of knowledge. Applying that stricter test to the trial record, the Court found enough evidence that the Hong Kong manufacturer suspected SEB's patent and hid its copying from its own lawyer, so the liability verdict against it stood.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Manufacturers who copy foreign products and then structure their legal reviews to avoid discovering existing patents can no longer claim ignorance as a defense. The decision raises the bar for companies performing patent clearance work, encouraging fuller disclosure to attorneys and more thorough patent searches before selling copied designs in the United States.
What changes now
Because the Court found the trial evidence sufficient to satisfy the correct willful-blindness standard, it did not send the case back for a new trial despite disagreeing with the lower court's looser 'deliberate indifference' test. The judgment against Pentalpha is final. Going forward, litigants and courts applying the patent inducement statute must use the Court's two-part willful-blindness test rather than a broader 'knew or should have known' standard.
What this does not decide
The Court did not decide whether willful blindness could satisfy knowledge requirements in other patent-law contexts beyond the specific inducement claim here, and it left open whether the induced acts themselves (not just the existence of the patent) must also be knowingly caused, since Pentalpha undisputedly knew its buyers were reselling in the U.S.
Concurrences and dissents
Dissent — Justice Kennedy
“Willful blindness is not knowledge; and judges should not broaden a legislative proscription by analogy.”Kennedy's core objection to treating willful blindness as equivalent to actual knowledge.
Justice Kennedy agreed that the inducement statute requires actual knowledge that the induced acts infringe a patent, but objected to the majority's decision to let willful blindness substitute for that knowledge. He argued willful blindness is not the same as knowledge, that courts should not broaden a knowledge requirement by analogy, and that patent law's utilitarian purposes don't justify borrowing a criminal-law moral rationale. He would have remanded to the Federal Circuit to assess the evidence under the correct knowledge standard rather than deciding sufficiency himself.
How the Court got there
The legal reasoning, step by step
- The Court examined the text of the induced-infringement statute, which makes someone liable for 'actively' inducing patent infringement, and found the wording ambiguous about whether the inducer must actually know the induced conduct infringes a patent.
- Looking to pre-1952 case law that the statute was meant to codify, the Court found conflicting signals, but treated its own precedent in Aro Manufacturing Co. v. Convertible Top Replacement Co. (a 1964 case interpreting the related provision on selling infringing components) as controlling.
- Because Aro II held that a seller of a component must know the invention was both patented and infringing, and because the induced-infringement provision shares a common origin and identical ambiguous wording with that component-selling provision, the Court concluded the same knowledge requirement must apply to inducement liability.
- The Court then imported the doctrine of 'willful blindness' from criminal law — the idea that someone who deliberately avoids confirming a fact they strongly suspect is true can be treated as if they actually knew it — and adopted a two-part test: the defendant must subjectively believe there is a high probability a fact exists, and must take deliberate action to avoid confirming it.
- Applying that test to the trial record, the Court found ample evidence that the Hong Kong manufacturer suspected SEB held a patent (given the fryer's superior, unusual design) yet deliberately withheld from its own patent lawyer the fact that it had copied SEB's design, supporting a finding of willful blindness rather than mere carelessness.
Doctrinal impact
Cases affected by this decision
Reaffirms Aro Mfg. Co. v. Convertible Top Replacement Co. (377 U. S. 476)
The Court relied on this 1964 case's knowledge requirement for component sellers to set the same standard for inducement.