Induced and Contributory Patent Infringement Explained

A business can face patent liability even when it does not itself perform every step of a patented method or assemble every element of a patented product. Instructions, technical support, marketing, and the sale of a specially adapted component can connect a supplier to a customer’s direct infringement.

That is why the distinction between direct, induced, and contributory patent infringement matters. The three theories have different proof requirements. Treating them as interchangeable can lead a patent owner to overlook essential evidence or cause an accused supplier to misunderstand the significance of its manuals, product design, customer communications, and knowledge of a patent.

A recent Federal Circuit decision illustrates the stakes. In NCS Multistage Inc. v. TCO Group AS, decided September 14, 2026, the court affirmed a judgment of contributory infringement involving components used in oil-and-gas well tools. The nonprecedential opinion is also a warning about preserving the right arguments at the right stage of litigation.

Section 271 creates different paths to patent liability

The starting point is 35 U.S.C. § 271. Subsection (a) addresses direct infringement. Subsections (b) and (c) address two forms of indirect infringement: inducement and contributory infringement.

Direct infringement: the underlying act

Under § 271(a), a person directly infringes by making, using, offering to sell, selling, or importing a patented invention in the United States without authority during the patent term. Direct infringement generally does not require proof that the accused party knew about the patent or intended to infringe. The question is whether the accused conduct satisfies every limitation of an asserted claim.

For a patented method, every claimed step must be performed by one actor or be legally attributable to one actor. The Supreme Court explained in Limelight Networks, Inc. v. Akamai Technologies, Inc. that inducement cannot exist without underlying direct infringement. Later Federal Circuit decisions have addressed when another party’s steps may be attributed to a single actor, including circumstances involving direction or control.

For an apparatus claim, the analysis focuses on whether the accused product contains or is configured with every required limitation. Tucker Law’s guide to patent claim construction explains why the meaning of even one disputed term can change that result.

Induced infringement: encouraging another party’s infringement

Section 271(b) provides that anyone who “actively induces” patent infringement is liable as an infringer. A patent owner ordinarily must prove three points:

• a third party directly infringed the patent;
• the accused inducer took affirmative steps to encourage, recommend, or promote the infringing conduct; and
• the accused inducer knew of the patent and knew that the encouraged acts constituted infringement.

The required conduct may appear in product instructions, training, advertising, technical support, configuration assistance, labels, sales presentations, or communications targeted to the accused use. Merely knowing that customers might infringe is not necessarily active inducement. The evidence must connect the defendant’s conduct to actual direct infringement.

The Supreme Court’s decision in Global-Tech Appliances, Inc. v. SEB S.A. held that inducement requires knowledge that the induced acts constitute patent infringement. The Court also recognized that willful blindness can satisfy the knowledge requirement. Willful blindness is demanding: the defendant must subjectively believe there is a high probability that a fact exists and take deliberate action to avoid learning that fact. Recklessness or negligence is not enough.

Contributory infringement: supplying a nonstaple component

Section 271(c) applies to certain sales or offers to sell a component of a patented machine, manufacture, combination, or composition, or a material or apparatus for practicing a patented process. The component must constitute a material part of the invention, and the seller must know it was especially made or adapted for use in an infringement. Liability does not extend to a staple article or commodity suitable for substantial noninfringing use.

In practical terms, contributory infringement asks whether the supplier provided a meaningful part that was designed for the patented combination or process, knew the relevant circumstances, and lacked a substantial noninfringing use for the component. A credible alternative use can therefore be central to the defense. Whether a use is “substantial” is fact-specific; a theoretical possibility and an established commercial use do not carry the same evidentiary weight.

Inducement and contributory infringement are not interchangeable

Both theories depend on direct infringement, but they focus on different conduct. Inducement centers on affirmative encouragement. Contributory infringement centers on the nature of the supplied component, the seller’s knowledge, and the absence of substantial noninfringing uses.

A multipurpose product may be difficult to characterize as a nonstaple component under § 271(c), yet the supplier’s targeted instructions could still support inducement under § 271(b). Conversely, a specially adapted component with no substantial noninfringing use may support contributory liability even if the patent owner cannot prove a separate promotional campaign. The complaint, discovery plan, expert analysis, and verdict form should keep those theories distinct.

What NCS Multistage v. TCO Group adds

The patent in NCS Multistage concerned float-tool technology used to position a casing string in a wellbore. A jury found that TCO induced infringement and contributorily infringed claims 28 and 29 of U.S. Patent No. 10,465,445. The district court entered judgment on both theories.

On appeal, the Federal Circuit stated the contributory-infringement elements relevant to the dispute: direct infringement, knowledge of the patent, a component with no substantial noninfringing uses, and a component that is a material part of the invention. NCS’s trial theory was that a licensee would buy glass-disc assemblies from a TCO affiliate and that the assemblies had no substantial noninfringing uses.

TCO argued on appeal that it did not sell the glass components and that its subjective belief in noninfringement defeated the knowledge requirement. The court held that those arguments had not been properly preserved in TCO’s post-trial briefing. It therefore affirmed the contributory-infringement judgment. The panel also noted that, even apart from forfeiture, competing trial evidence about TCO’s knowledge provided substantial support for the verdict.

Because contributory infringement independently supported the judgment, the Federal Circuit did not reach TCO’s induced-infringement arguments. The court separately vacated the judgment of no invalidity and remanded for a new trial on invalidity. The opinion did not hold that the patent was valid or invalid.

The decision is nonprecedential, but its practical lessons are broader than the specific tool. An indirect-infringement case may turn on who sold the component, whether an affiliate’s acts are attributable to the defendant, what noninfringing uses existed, what the supplier knew, and whether each argument was preserved in the trial record and post-trial motions.

Knowledge of infringement is different from belief in invalidity

Indirect infringement includes a mental-state requirement that direct infringement ordinarily does not. But the knowledge analysis has an important limit.

In Commil USA, LLC v. Cisco Systems, Inc., the Supreme Court held that a defendant’s belief that a patent is invalid is not a defense to induced infringement. Validity and infringement are separate questions. A party that believes a patent should never have issued may challenge validity, but that belief does not erase the statutory knowledge required for inducement.

A genuine belief that the encouraged conduct does not infringe can be relevant to whether the defendant knew the induced acts were infringing. That issue depends on the facts, the claim analysis, and the evidence of the defendant’s actual state of mind. A conclusory statement created after litigation begins is not equivalent to a contemporaneous technical and legal assessment.

At the same time, 35 U.S.C. § 298 provides that failure to obtain advice of counsel, or failure to present that advice in court, may not be used to prove willful infringement or intent to induce infringement. The statute prevents an automatic adverse inference. It does not make early claim analysis, documentation, and product review irrelevant to business decisions.

Evidence patent owners should develop

A patent owner asserting indirect infringement should identify the underlying direct infringer and the acts that satisfy every claim limitation. General allegations that “customers use the product” may not be enough. Useful evidence can include product telemetry, customer testimony, testing records, installation documents, service communications, manuals, videos, and technical demonstrations.

For inducement, the evidence should show affirmative encouragement tied to the infringing use and the defendant’s knowledge. For contributory infringement, the record should address the component’s design, role in the claimed invention, sales chain, intended uses, and any asserted noninfringing uses.

Remedies should also be considered early. The theory linking the supplier to downstream infringement may affect the recoverable sales base, notice issues, expert analysis, and requests for injunctive relief. Tucker Law’s patent litigation practice evaluates liability and remedies as parts of the same case strategy.

Risk controls for suppliers and technology companies

A supplier should not wait for a complaint before understanding how customers use its product. Product counsel and technical teams can review patent notices, claim language, manuals, default configurations, application notes, support scripts, marketing claims, and the availability of genuine noninfringing uses.

Contracts also matter. Patent licenses, supply agreements, development agreements, and customer terms may allocate notice, defense, indemnity, cooperation, and design-change duties. A license may authorize some parties, products, fields, or uses while leaving others exposed. Tucker Law’s patent licensing practice addresses those scope and allocation questions.

When risk appears, possible responses may include revising instructions, disabling an infringing configuration, creating a design-around, documenting noninfringing uses, seeking a license, challenging the patent, or preparing a noninfringement position. The right response depends on the claims and the actual product—not merely the patent title or a competitor’s accusation.

Territorial facts require separate attention. Section 271(a) concerns specified conduct in or importation into the United States, while other subsections address certain components supplied from the United States and certain products made by patented processes. Global supply chains should be mapped before anyone assumes that foreign manufacture or overseas customer use ends the analysis.

The practical takeaway

Direct infringement asks whether every claim limitation is practiced. Inducement asks whether another party’s direct infringement was knowingly encouraged. Contributory infringement asks whether a knowledgeable supplier provided a material, specially adapted component that lacked substantial noninfringing uses.

Those distinctions shape pleadings, discovery, expert work, product documentation, and trial preservation. The recent NCS Multistage decision shows that a component case can survive on contributory infringement alone—and that an argument not properly preserved may never receive a merits decision on appeal.

If your company supplies components, software, instructions, or technical support connected to a patented product or method, or if your patent is being practiced through a supply chain, contact Tucker Law. Tucker Law can evaluate the asserted claims, user conduct, supplier evidence, licensing position, and litigation options. For out-of-state counsel handling a Florida patent dispute, the firm also serves as Florida patent litigation local counsel.

This article provides general information and is not legal advice. Patent infringement depends on the asserted claims, accused conduct, knowledge evidence, territorial facts, and procedural posture.