Network-1 Technologies, Inc. v. Google LLC

Network-1 Technologies, Inc. v. Google LLC The Federal Circuit affirmed indefiniteness of the '988 and '464 patent claims on the term 'non-exhaustive search' and affirmed summary judgment of noninfringement of the '237 patent as to the LSH version of Content ID, but reversed summary judgment of noninfringement as to the Siberia version of Content ID, finding a genuine issue of material fact on whether Siberia's 'tunable knobs' and an internal Google document stating it 'will need a sublinear search' satisfy the 'sublinear approximate nearest neighbor search' limitation. The decision illustrates that claim terms added years after filing to overcome prior art—without clear definitional support in the specification—face serious indefiniteness risk, and that a single internal design document stating a system 'will need' a claimed feature can be enough to survive summary judgment of noninfringement. Affirmed in part, reversed in part, and remanded. Indefiniteness ('988 and '464 patents): The term 'non-exhaustive search' was added to the claims nine years after the provisional filing and three years after the patent filing date to overcome prior art, but the specification never uses the phrase and does not draw a clear line between 'exhaustive' and 'non-exhaustive' searching in terms of how much data must be considered—neither intrinsic nor extrinsic evidence (including Network-1's expert declaration and academic papers) resolved the ambiguity. Prior IPR analysis informative but not binding: The court noted that its earlier BRI-standard construction of 'non-exhaustive search' in the IPR appeal (vacating the Board) was instructive on the written-description analysis even though the Phillips standard applies in district court, because the specification's deficiency is standard-agnostic. Summary judgment affirmed as to LSH version: Network-1's evidence—Baluja research papers, a 2010 Google draft document, and an expert report—all failed to connect to the actual implementation of the LSH Content ID system; the draft document contemplated both sublinear and non-sublinear LSH tables without evidence of which was built, and the expert report merely walked through the code without analyzing sublinearity. Summary judgment reversed as to Siberia version: Two pieces of evidence created a triable issue—(1) evidence that Siberia's 'tunable knobs' allowed the system to adapt execution time to a growing dataset in less than a proportional relationship, and (2) an internal Google document stating Siberia 'will need a sublinear search,' which a factfinder could read as imposing a sublinear requirement on any Siberia implementation. Practical takeaway on expert reports: The court reiterated that an expert opinion that merely describes how a system works without analyzing why it satisfies the disputed claim limitation is insufficient to defeat summary judgment. § 112(b) claim construction infringement remand non-precedential § 112(b) claim construction infringement remand non-precedential § 112(b) infringement remand non-precedential