Apple has lost a motion to include the recently-launched Galaxy S4 among a list of infringing products in its second of two US lawsuits against Samsung. Adding another product would be a "tax on the court's resources," said Magistrate Judge Paul Grewal in a ruling earlier this week. "Each time these parties appear in the courtroom, they consume considerable amounts of the court's time and energy, which takes time way from other parties who also require and are entitled to the court's attention."