Federal Circuit Affirms Noninfringement Ruling in Sony Controller Patent Case

In a precedential decision issued on February 19, 2026, the U.S. Court of Appeals for the Federal Circuit affirmed summary judgment of noninfringement for Sony in a patent case involving PlayStation controllers and consoles. The decision highlights an important point for patent litigants: when a claim is written in means-plus-function form, the patent owner must prove that the accused product uses the same structure, or an equivalent structure, as the one disclosed in the patent specification.

The case is Genuine Enabling Technology LLC v. Sony Group Corporation, No. 2024-1686 (Fed. Cir. Feb. 19, 2026).

Background

Genuine Enabling Technology LLC asserted U.S. Patent No. 6,219,730 against Sony Group Corporation and Sony Interactive Entertainment LLC. The patent relates generally to computer input devices and describes a way to combine multiple input streams into a single data stream so a computer can use fewer dedicated resources, such as ports or processing channels.

GET accused Sony’s PlayStation 3 and PlayStation 4 controllers and consoles of infringement. According to GET, the Bluetooth module in those products synchronized button inputs with sensor inputs, such as data from accelerometers, in a way that satisfied the asserted claims.

GET filed suit in 2017 in the U.S. District Court for the District of Delaware. The district court later granted summary judgment for Sony, meaning the court found there was no genuine factual dispute requiring a trial on infringement. GET appealed.

What the Court Decided

The Federal Circuit affirmed the district court’s summary judgment of noninfringement. It held that GET had not produced sufficient evidence for a reasonable jury to find that Sony’s accused products met the claimed “encoding means” limitation.

The court reviewed the summary judgment ruling de novo, which means it gave fresh review to the legal question without deferring to the district court’s conclusion. The Federal Circuit agreed, however, that GET’s infringement theory was too incomplete to survive summary judgment.

The opinion also states that GET appealed the district court’s exclusion of parts of its expert testimony, but the Federal Circuit’s core analysis focused on the failure to show structural equivalence for the means-plus-function limitation.

Court’s Reasoning

The key issue was a claim limitation written in means-plus-function form under 35 U.S.C. § 112(f). In plain English, that type of claim defines an element by what it does, rather than by naming a specific structure. The law limits that claim language to the structure disclosed in the patent specification and its equivalents.

Here, the parties agreed that “encoding means” was a means-plus-function limitation. The specification identified the corresponding structure as logic block 34 in Figure 4A, a multi-component circuit used to synchronize and combine data streams.

That detail mattered. To prove literal infringement, GET needed to show not only that Sony’s products performed the same function, but also that the accused structure was identical or equivalent to the disclosed structure. In this context, the court focused on whether the accused products worked in substantially the same way.

The Federal Circuit agreed with the district court that GET’s proof fell short because its expert did not account for many of the components in logic block 34. Instead, the expert narrowed the analysis to only part of the disclosed structure, without adequately explaining why the omitted components could be disregarded.

The opinion emphasized that the patent specification described a multi-step synchronization process involving several elements, including signal generation, conversion, selection, and storage. Because GET’s infringement case did not meaningfully address that full structure, the court found the analysis conclusory.

The Federal Circuit summarized the rule this way: a means-plus-function limitation covers the structure described in the specification “and equivalents thereof.” It also reiterated that literal infringement requires the accused structure to perform the identical function and to be identical or equivalent to the disclosed structure.

Practical Implications: What Companies Should Do Now

This decision is a useful reminder that means-plus-function claims can narrow as well as broaden a case. For patent owners, the opinion underscores the need to map the accused product to the full disclosed structure, not just a high-level function. If the patent identifies a detailed circuit, process, or architecture, the infringement theory should address that detail directly.

For accused infringers, the case offers a roadmap for early dispositive motions. Where the asserted claims rely on means-plus-function language, defendants should test whether the patent owner’s expert has tied the infringement theory to the entire corresponding structure disclosed in the specification.

Companies evaluating patent risk should also revisit claim construction and expert strategy early. In cases involving software, electronics, or complex systems, the specification’s structural detail may be outcome-determinative.

• Review asserted claims for means-plus-function language under Section 112(f).
• Identify the full corresponding structure disclosed in the specification.
• Align expert analysis with the disclosed structure, not just the claimed function.
• Consider whether summary judgment may be available if the opposing theory omits key structural elements.