Good Faith Belief in Invalidity No Defense to Active Inducement

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The U.S. Supreme Court (Justice Kennedy writing for the majority) has now eliminated a defense that has been available to parties accused of actively inducing patent infringement under 35 USC § 271(b). The Court held that a good-faith belief of invalidity of a U.S. patent is not a defense to a charge of inducing infringement. Commil USA, LLC v. Cisco Systems, Inc., Case No. 13-896, (May 26, 2015); 575 U.S. ___ (2015) (Scalia, J., dissenting, joined by Roberts, C.J.) (Breyer, J., took no part in the case).

In reversing the Federal Circuit on the issue presented, the Supreme Court held that Cisco’s good-faith belief that the Commil patent at issue was invalid is not a defense to Commil’s claim that by selling products for its customers’ use, Cisco induced infringement.

However, the Supreme Court also took the opportunity to reaffirm its 2012 holding in Global-Tech Appliances, Inc. v. SEB S.A. (IP Update, Vol. 14, No. 6) regarding the requirements for proving induced infringement. The Court confirmed that in order to prove active inducement a patent owner must show that the accused infringer has both knowledge of the patent and knowledge that the induced acts constitute patent infringement. In doing so, the Court rejected the position of Commil and the U.S. Government, both of which argued that knowledge that the induced acts constitute infringement was not required for a finding of induced infringement.

In Depth


Commil is the owner of a patent directed to short-range wireless networks and, in the words of the Court, claims “a method of providing faster and more reliable communications between devices and [wireless network] base stations.” Commil sued Cisco, a maker and seller of wireless-network equipment, alleging both direct infringement and active inducement in selling its equipment for others to use. On the inducement count, Cisco raised the defense that it had a good faith belief that Commil’s patent was invalid; but the district court found evidence of that belief “inadmissible.”

On appeal, the Federal Circuit found the district court had erred in excluding Cisco’s evidence of its good faith belief that the patent was invalid. Commil then petitioned the Supreme Court for certiorari and this appeal followed.

Global-Tech Revisited

During the pendency of Commil’s action in the district court, but after the jury verdict, the Supreme Court issued its opinion in Global-Tech, holding that in order to be liable for inducement, the accused infringer must both know of the patent and that “the induced acts constitute patent infringement. In its charge to the jury (and over Cisco’s objection), the district court instructed that liability for inducement exists if the defendant “knew or should have known that its actions would induce infringement” (emphasis added). Although the Federal Circuit found that instruction erroneous based on Global-Tech, Commil and amicus, the U.S. Government, argued to the Supreme Court that Global-Tech should be read as only requiring knowledge of the patent to support a claim of inducement, thus occasioning the Court to revisit its Global-Tech ruling, if only to emphasize that “Global-Tech’s explicit holding that liability for induced infringement can only attach if the defendant knew of the patent and knew as well that ‘the induced acts constitute patent infringement.’”

Infringement vs. Invalidity

Justice Kennedy, starting with the premise stated in Global-Tech that intent is an element of active inducement under § 271(b), explained that the intent required relates to acts of infringement, and “that infringement and invalidity are separate matters under patent law.” The Court then concluded that “permitting a defense of belief in invalidity would conflate issues of infringement and validity” and would undermine the presumption of validity.

Quoting from Judge Newman’s dissent in Commil (and alluding to the dissent here), Justice Kennedy dismissed the argument that an invalid patent cannot be infringed as a “simple truth” that ignores the statutory framework. As Justice Kennedy explained “invalidity is not a defense to infringement, it is a defense to liability” and “cannot negate the scienter” requirement.

The Court went on to explain that infringement and validity are “separate issues” under the Patent Act and cited various aspects of the Act as evidencing the intent of congress to establish this dichotomy. Rather than a defense to infringement, the Court reasoned that any belief regarding invalidity should be tested in a declaratory judgment claim (or counterclaim) or in a post-issuance PTO proceeding.

The Dissent

In his dissent, Justice Scalia (joined by Chief Justice Roberts) found the majority’s reasoning regarding the divisibility between infringement and invalidity “not persuasive.” Justice Scalia took particular aim at the majority’s explanation that it did not want “to create a defense based on good faith belief in invalidity” (emphasis in original). In the view of the dissent, the job of the Court is not to create defenses, but is simply to interpret the patent laws. Given that Global-Tech makes knowledge of infringement a requirement for active inducement, and there can be no such knowledge in the case of an invalid patent, the dissent would find that a “good faith belief in invalidity is a defense” to inducement.

Practice Note

The majority opinion takes a detour to justify its holding by noting that frivolous cases of induced infringement can be addressed through administrative proceedings at the U.S. Patent and Trademark Office (USPTO), such as re-examinations and proceedings before the U.S. Patent Trial and Appeal Board (PTAB), and sanctions and fees imposed by district courts. As the majority notes, “[T]hese safeguards, combined with the avenues that accused inducers have to obtain rulings on the validity of patents, militate in favor of maintaining the separation expressed throughout the Patent Act between infringement and validity.” However, it is not self-apparent that the availability of these venues and remedies address the fundamental issue raised by the dissent.

Cisco decision should not significantly impact the cost to accused infringers of defending patent litigation in district court. Parties defending such charges likely will continue to spend the time, effort and costs of raising invalidity issues as a defense to infringement, whether direct, contributory or by inducement. However, parties charged with induced infringement predicated on the Global-Tech knowledge requirements will now be limited to pursuing a defense based on a good-faith belief of non-infringement. When such a party has a good-faith belief that a patent is invalid, it may wish to pursue other available relief, such as declaratory judgment jurisdiction or PTAB proceedings, and requesting sanctions and attorneys’ fees from the district court in those instances where the as-filed case proves to be frivolous.