On Wednesday, CLS Bank filed a brief opposing U.S. Supreme Court review of a spectacularly controversial en banc decision from the Federal Circuit Court of Appeals. You probably remember the Federal Circuit ruling from last May in the CLS case: The en banc court held that Alice Corp’s computer-implemented escrow system is not eligible for patents, but couldn’t muster a majority to explain why. The 10 appellate judges ended up writing six different opinions, none of which attracted enough co-signers to provide long-sought clarity on a standard for the patent-eligibility of abstract ideas that are implemented via computers. As Alice’s lawyers at Sidley Austin explained in their certiorari petition in May, “The legal standards that govern whether computer-implemented inventions are eligible for patent protection … remain entirely unclear and utterly panel dependent.”