Below are sketches of arguments the Court heard in Bowman v. Monsanto.
Monsanto sells its brand of genetically engineered soybean seed to farmers with the stipulation that they will not replant the crop seed. Indiana farmer Vernon Bowman abided by Monsanto's rules when he planted his first crop, but for a second late-season crop he decided to plant seed purchased from a grain elevator figuring much of it would seed grown from Monsanto's Rounup resistant strain. He was right, but Monsanto sued.
Bowman's lawyer, Mark Walters, had a hard time convincing Justices that once Monsanto sold its seed the patent was exhausted. "The Exhaustion Doctrine permits you to use the goods that you buy," Justice Sonia Sotomayor said. "It never permits you to make another item from the item that you bought."
Monsanto's lawyer Seth P. Waxman said the company "never would have produced what is, by now the most popular agricultural technology in America" if the patent had been so easily exhausted.
WaPo story here.