The U.S. Court of Appeals for the Federal Circuit upheld the PTAB's decision, finding that the challenged Microsoft patents were invalid due to obviousness based on prior art.
Mark Sandstrom argued the PTAB erred in declaring his patents obvious, but CAFC found no unreasonable evidence against the Board's decisions on prior art combinations.
The PTAB specifically concluded that a skilled artisan would have been motivated to combine Agrawal and Brent, leading to obvious conclusions for multiple patent claims.
In affirming the PTAB's decisions, the CAFC reinforced the idea that combinations of prior art can render patent claims unpatentable if deemed obvious to skilled artisans.
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