Apple v. Smart Mobile Technologies — Federal Circuit Preserves Wireless Patent Claims and Orders New Obviousness Review

Background

Smart Mobile Technologies owns a family of patents covering mobile wireless devices that use multiple transmitters, receivers, antennas, and network paths. After Smart Mobile accused Apple of infringing the patents, Apple sought inter partes review (IPR)—a Patent Trial and Appeal Board proceeding used to challenge issued patent claims—based on combinations of earlier wireless-communication references.

Two companion Federal Circuit opinions addressed three patents. In the lead appeals, involving U.S. Patent Nos. 8,842,653 and 9,019,946, Apple challenged the Board’s refusal to invalidate claims requiring a single interface made up of “multiplexed signals.” Smart Mobile cross-appealed the Board’s conclusion that a different group of claims was obvious. A second opinion addressed U.S. Patent No. 9,319,075 and the same central claim-construction dispute.

The Court’s Holding

The Federal Circuit agreed with the Board that “multiplexed signals” means combining multiple signal streams into one before sending them simultaneously over a shared physical path. The term does not include mere switching, in which separate signals use the same path one after another. The claim language referred specifically to signals being multiplexed, and the shared specification likewise described multiplexing as an operation performed on signals rather than simply on transmission paths.

Applying that construction, the panel held that substantial evidence supported the Board’s finding that Apple’s cited references did not disclose the claimed multiplexing. One reference required a user to select either a cellular or wireless-local-area network, while the relevant embodiment of the other did not show the necessary multiplexer. The court therefore affirmed the survival of the challenged claims in all three patents.

Smart Mobile also won a remand on another set of claims. Apple argued that a skilled engineer would combine a prior-art phone with the multi-network functionality of an external cradle. Smart Mobile responded with expert evidence that the proposed serial interface would create a substantial data bottleneck, making the combination unattractive. The Board nevertheless said Smart Mobile had not answered Apple’s rationale. Because that statement overlooked a developed argument supported by expert evidence, the Federal Circuit could not tell whether the Board had weighed the combination’s benefits against its drawbacks. It vacated the obviousness ruling for claims 17–21 and 23–26 of the ‘653 and ‘946 patents and returned those claims to the Board.

Key Takeaways

• Claim language tying “multiplexed” to signals can exclude sequential switching over a shared path.
• A patent challenger must show that the prior art teaches the limitation under the correct construction; general multi-network capability is not necessarily enough.
• The PTAB must confront material evidence that a proposed combination would degrade performance, not merely identify benefits of making the combination.
• A remand is not a final victory on validity: the Board must now reconsider the affected claims under a complete motivation-to-combine analysis.

Why It Matters

The decisions preserve important claims in Smart Mobile’s wireless-device patent portfolio while reopening the status of others. More broadly, they show how a seemingly ordinary networking word can determine the result of an IPR. For companies challenging patents, the ruling underscores the need to connect technical prior-art disclosures to the precise mechanics required by the claims.

The remand also reinforces an administrative-law safeguard in patent proceedings. When an expert identifies a concrete engineering tradeoff—here, a serial-interface bottleneck—the Board must meaningfully account for it. Obviousness asks whether a skilled person would have made the proposed combination, so practical disadvantages can matter as much as the combination’s promised gains.