Illinois Tool Works Inc. v. Independent Ink, Inc.
The Court ruled that owning a patent does not by itself prove a company has market power, ending decades of antitrust law that assumed patents automatically gave sellers that kind of leverage.
Because of this, companies accused of illegally bundling a patented product with a required unpatented purchase (a practice called tying) can no longer be found guilty automatically — the challenger now must prove the company actually has power in the market, a change that makes many tying claims harder to win.
How it got here: A federal trial court granted summary judgment to the printer maker; the Federal Circuit reversed on the antitrust tying claim; the Supreme Court agreed to review it.
The Case in Depth
What happened
A printing-equipment maker sold patented printheads and ink containers along with unpatented ink, requiring buyers to purchase ink only from it and never refill the containers. A rival ink maker that copied the ink's formula was sued for patent infringement, then countersued, arguing the arrangement was illegal antitrust "tying" — using power over one product to force purchases of another.
The question before the Court
If a company sells a patented product on condition that buyers also purchase an unpatented supply from it exclusively, does the patent alone prove the company has market power?
The Court's answer
No — the Court ruled that simply holding a patent does not automatically prove a company has market power over the product. For decades, courts presumed that a patent gave its owner enough power that tying a patented product to an unpatented one was automatically illegal. The Court abandoned that presumption.
The Court explained that Congress had already eliminated this same presumption in patent-misuse cases in 1988, which undercut the antitrust version's foundation, and that most economists and enforcement agencies had also rejected the assumption. Going forward, anyone challenging a tying arrangement must actually prove the seller has power in the relevant market — proof, not presumption, is now required in every case.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Businesses that sell patented equipment along with supplies or add-ons — printer makers requiring their own ink, appliance makers requiring their own parts, and similar arrangements — face a lower risk of automatic antitrust liability. Plaintiffs challenging these bundling deals must now do the harder work of proving real market power, which will make some tying lawsuits more expensive and harder to win.
What changes now
The case goes back to the trial court, where the ink maker will get a chance to present evidence defining the relevant market and showing whether the printer maker actually has power within it — something it had not needed to do under the old presumption. This is a final merits ruling on the legal standard, though the underlying antitrust dispute is not yet resolved and will continue in the lower court.
What this does not decide
The Court did not decide whether this particular tying arrangement was actually illegal — it only changed the legal standard for how such claims must be proven. Some tying arrangements can still be unlawful, such as those built on a true monopoly or a marketwide conspiracy, but that must be shown with evidence, not assumed from the patent alone.
How the Court got there
The legal reasoning, step by step
- The Court traced how its own tying-arrangement cases had gradually moved away from assuming sellers have market power toward requiring actual proof of it, noting that this shift had already occurred for tying products that were not patented, in cases like Fortner II and Jefferson Parish Hospital Dist. No. 2 v. Hyde (a 1984 case involving hospital services).
- The Court found that the presumption that a patent alone confers market power originated not in antitrust law but in the separate patent misuse doctrine, a judge-made rule limiting when a patent owner can enforce its patent, and that the presumption migrated into antitrust law through International Salt Co. v. United States, a 1947 case.
- The Court observed that in 1988 Congress amended the Patent Code to eliminate this same presumption from patent misuse cases, requiring proof of actual market power before a patent owner's tying condition could be called misuse.
- Reasoning that it would be inconsistent to keep the presumption alive in antitrust law after Congress removed its own foundation in patent law, the Court concluded the presumption's underpinnings had collapsed.
- The Court rejected the challenger's proposed compromises — a rebuttable presumption of market power, or a special rule for arrangements involving ongoing purchases — finding no economic or legal basis to treat patented tying products differently from unpatented ones.
- Applying this new rule, the Court concluded that going forward, a plaintiff bringing a tying claim must affirmatively prove the seller has power in the relevant market, rather than relying on the mere existence of a patent.
Doctrinal impact
Cases affected by this decision
Overrules International Salt Co. v. United States (332 U. S. 392)
Its per se rule presuming market power from a patent on the tying product is discarded.
Overrules Morton Salt Co. v. G. S. Suppiger Co. (314 U. S. 488)
Its per se treatment of patent tying arrangements is replaced with a proof-of-market-power requirement.
Overrules United States v. Loew's Inc. (371 U. S. 38)
Its reliance on presumed market power from a patent is rejected as the governing rule.
Reaffirms Jefferson Parish Hospital Dist. No. 2 v. Hyde (466 U. S. 2)
Its requirement of proving actual market power now governs patented tying products too.
Reaffirms United States Steel Corp. v. Fortner Enterprises, Inc. (429 U. S. 610)
Its market-power proof requirement becomes the standard for all tying cases, including patents.