As expected, Chief Justice John Roberts, Jr. stood up and left the Supreme Court chamber at the beginning of oral arguments Wednesday in the complex patent case Microsoft v. AT&T. According to his most recent financial disclosure form, Roberts owns between $100,001 and $250,000 worth of Microsoft stock, a clear trigger for recusal. (For more on recent recusal decisions by Roberts and other justices, see the Legal Times feature Recusal Report). With Roberts out, Justice John Paul Stevens presided over the oral argument which led to a minor slip-up by former solicitor general Ted Olson, arguing for Microsoft. When Olson, a Gibson, Dunn & Crutcher partner, rose for his rebuttal, he addressed Stevens as "Justice Scalia," which got a hearty laugh from Stevens. Olson recovered quickly, explaining that he was focused on answering a point Scalia had made earlier.