Nest more formally responded to Honeywell's patent lawsuit both through a rejection of the claims inside as well as by drawing once more on Apple for top executives. The smart thermostat maker claimed both that it doesn't use any of Honeywell's patents but that they were "hopelessly invalid." The arguments were "retreads" of prior art from companies like Volkswagen, obvious technology, or even examples of hiding its own older patents from the USPTO, Nest argued.