The CAFC ruled that the PTAB misinterpreted HD Silicon Solutions' patent claims, especially concerning the term 'comprising tungsten'. However, the CAFC found this misinterpretation to be harmless while affirming the PTAB's decision to invalidate the claims based on obviousness. The central issue revolved around whether 'tungsten' referred solely to elemental tungsten or included tungsten compounds. The CAFC emphasized the patent's specific wording favored the interpretation of elemental tungsten.
The CAFC determined that the PTAB incorrectly interpreted HD Silicon's patent claims regarding tungsten, but considered the error non-harmful, thus affirming the invalidation.
The specification cited by PTAB indicated tungsten could mean various forms, but CAFC highlighted the patent's precise language supporting elemental tungsten as the intended interpretation.
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