The US Court of Appeals for the Federal Circuit affirmed a district court determination that a patent owner had not provided the “particularized testimony and linking argument” required to demonstrate equivalence under the doctrine of equivalents. NexStep, Inc. v. Comcast Cable Commc’ns, LLC, Case No. 2022-1815 (Fed. Cir. Oct. 24, 2024) (Chen, Taranto, JJ.) (Reyna, J., concurring in part and dissenting in part). In his dissent, Judge Reyna criticized the majority for ignoring the totality of the evidence presented by the patent owner and imposing a new rule requiring patentees to always present expert testimony to prove infringement under the doctrine of equivalents.

NexStep owns a patent directed to a “concierge device” for assisting users with obtaining customer support for smart devices. The claims are directed to a concierge device that initiates a technical support session in response to “a single action” (i.e., a single button press) by a user. After the claimed “single action,” the concierge device conveys consumer device identification information for the product at issue, identifies an appropriate technical support team for the product, and causes the home gateway to initiate a support session for the device and forward the consumer device information during the session.

NexStep sued Comcast for patent infringement, asserting that three tools in Comcast’s mobile smartphone application infringed the concierge device patent: Xfinity Assistant, Troubleshooting Card, and Diagnostic Check. Each of these tools assists users with troubleshooting a given device in response to the user pressing a series of buttons on a smartphone’s display. At trial, NexStep argued that pressing a series of buttons literally met the single action limitation because a single action could comprise a series of steps. By way of illustration, NexStep’s expert explained that throwing a baseball – a single action – required multiple steps: “[W]hen you throw a baseball, you pick it up, you orient it, you get it in your palm, you throw it.”

The jury returned a verdict of no literal infringement but found infringement under the doctrine of equivalents. Comcast moved for judgment as a matter of law, which the district court granted after finding that NexStep had failed to offer the “particularized testimony and linking argument” required to demonstrate equivalence. NexStep appealed.

The Federal Circuit emphasized that the doctrine of equivalents provides a “limited exception” to the principle that the claim defines the scope of the patentee’s exclusivity rights, and that a finding under the doctrine of equivalents is “exceptional.” To guard against overbroad applications of this exception, the Court’s precedent imposes specific evidentiary requirements necessary to prove infringement under the doctrine. The patent owner must provide proof on an element-by-element basis and from the perspective of someone skilled in the art, “for example through testimony of experts or others versed in the technology; by documents . . . and . . . by the disclosures of the prior art.” Finally, the patent owner must provide “particularized testimony and linking argument as to the insubstantiality of the differences between the claimed invention and the [...]

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