“It’s a Huge Case for the Patent-Law Community.” On One Side: Google, Facebook, Intuit.  On the Other? IBM. “Because the patents are often unclear, there’s no way to know whether an infringement claim by a competitor or a troll is legitimate until you’ve spent $8 million in litigation fees,” said Mr. Schruers Ashby Jones in the Wall Street Journal  reports this morning that a federal appeals court in Washington, D.C., will hear arguments Friday over a fundamental question that has vexed the technology industry for nearly two decades: When is a piece of software patentable?