This case has been decided. See how it turned out!
SAS Institute challenged a patent using the inter partes review process.
SAS included 16 claims against the patent. The review board did not address all of SAS’s claims. It only issued a decision on some of them.
On November 27, 2017, SAS will argue to the Supreme Court that the law requires the board to address all of its claims.
Why does it matter if the board addresses all claims?
Besides that SAS would like a chance at invalidating the aspects of the patent that the board did not address, there is another argument.