The US Federal Circuit ruled that the Patent Trial and Appeal Board (PTAB) may reconsider factual issues on remand if they were not explicitly decided in a prior appeal. This decision clarifies the scope of the mandate rule in patent disputes, specifically regarding obviousness claims involving MPEG compression technology.
This ruling provides critical clarity for streaming technology firms navigating inter partes reviews, confirming that the PTAB retains the authority to address unresolved factual issues during remand. By narrowing the mandate rule, the court ensures that subsidiary findings not central to an initial appeal do not become accidentally binding, allowing for more thorough technical evaluations of encoding patents. For the broader streaming ecosystem, this lowers the barrier for challengers like Sony to invalidate broad patents by combining multiple prior art references. Industry strategists should watch for how this precedent affects the speed of remands in high-stakes MPEG and VVC compression litigation.
The legal landscape for 5G patent litigation continues to evolve as courts clarify jurisdictional boundaries and procedural rules for standard-essential patents, while other firms face invalidated ATSC 3.0 patents in similar regulatory disputes. Recent patent litigation involving codec workarounds further highlights the ongoing pressure on streaming platforms to navigate complex intellectual property portfolios, including Disney+ patent injunction risks. For more on the impact of these disputes, see the Disney+ InterDigital patent dispute.
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