On Monday, November 27, 2017, the Supreme Court of the United States heard oral argument in Oil States Energy Services, LLC v. Greene's Energy Group, LLC over whether inter partes review - an adversarial process used by the United States Patent and Trademark Office to analyze the validity of existing patents - violates the US Constitution.1 Although it is difficult to predict which way the Court will rule, the questions posed by each Justice in oral argument may signal the Justices' views on the issue of constitutionality of IPRs.