Background
Apple petitioned for inter partes review of claims in two Smart Mobile Technologies patents covering mobile wireless devices with multiple transmit-and-receive components. The Patent Trial and Appeal Board found that Apple had not proved certain claims requiring a “single interface comprised of multiplexed signals” unpatentable, but held other claims— including claims requiring a processor to combine data paths into a single transmission interface—unpatentable as obvious.
Apple appealed the rulings concerning “multiplexed signals,” arguing that the term encompassed multiple inputs sharing a physical resource even when their signals were transmitted sequentially. Smart Mobile cross-appealed the obviousness rulings, arguing that the Board failed to address its evidence that combining the cited Yegoshin and Bernard references would create an undesirable serial-interface bottleneck.
The Court’s Holding
The Federal Circuit affirmed the Board’s judgment that Apple failed to prove claims 1-13 and 27-30 of the ’653 patent and claims 1-13, 16, and 26 of the ’946 patent unpatentable. It agreed with the Board’s implicit construction of “multiplexed signals” as requiring multiple signal streams to be combined into a composite signal for simultaneous transmission along a single shared physical pathway, excluding sequential switching. Substantial evidence supported the Board’s findings that neither Yegoshin nor Bernard disclosed multiplexed signals under that construction.
On Smart Mobile’s cross-appeal, the court vacated the Board’s judgment that claims 17-21 and 23-26 of both patents were obvious and remanded. The Board incorrectly stated that Smart Mobile and its expert had not answered Apple’s motivation-to-combine theory, even though Smart Mobile presented evidence that the proposed combination would cause bottlenecking. Because the court could not reasonably discern whether the Board considered that evidence or weighed the proposed combination’s benefits against its detriments, further proceedings were required.
Key Takeaways
- “Multiplexed signals” requires combining multiple signal streams into one composite signal for simultaneous transmission over a shared physical pathway; sequential use of the same pathway is not enough.
- The Federal Circuit affirmed only that Apple failed to carry its burden to prove the specified claims unpatentable in these IPRs.
- A Board obviousness analysis must address material, evidence-supported arguments concerning disadvantages of a proposed prior-art combination, including whether those disadvantages outweigh its asserted benefits.
Why It Matters
The nonprecedential decision illustrates that an implicit claim construction remains reviewable when the Board’s analysis establishes a term’s scope. It also reinforces the APA requirement that the Board meaningfully address material evidence bearing on motivation to combine.
The remand does not resolve whether claims 17-21 and 23-26 are ultimately obvious. It requires the Board to reconsider that issue after evaluating both the claimed benefits of the proposed combination and Smart Mobile’s bottlenecking evidence.