Short Summary
The PTAB denied the IPR petition against claims 1-4 of U.S. Patent No. 9,457,541, finding that the combination of prior art references did not render the copper foil obvious. The Board ruled that the petitioner failed to demonstrate a reasonable expectation of success when combining properties from materially different sources.
Detailed Summary
The Petitioner (Solus Advanced Materials Co., Ltd.) sought to invalidate claims 1-4 of U.S. Patent No. 9,457,541, which relates to copper foil for lithium secondary batteries, alleging obviousness over combinations of prior art references including Kim, Hara, Otsuka, and Ye. The Petitioner argued that combining properties such as texture coefficient ratios, weight deviation, and tensile strength would be predictable in the field. However, the Board ultimately denied the petition, holding that the Petitioner failed to articulate a sufficient motivation or reasonable expectation of success for combining disparate properties from different references without resorting to hindsight.
Practitioner Note
This case demonstrates the evidentiary and procedural standards applied in patent matters before local courts. Understanding the court's reasoning in Solus Advanced Materials Co., Ltd. et al. vs SK nexilis Co., Ltd. is valuable context for structuring arguments or assessing risk in similar proceedings.
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