Several configurations of a folding phone were displayed on the patent application, and sketches of the device even include an iPod icon on its home screen. Despite Apple and Samsung having a contentious relationship when it comes to protecting their own patents, Samsung does make several critical components for Apple's mobile devices.
The patent, titled Foldable Device and Method Of Controlling The Same, was submitted to the USPTO on May 26th, 2015. Some questions about the patent remain. For example, it isn't clear if the device closes with the two screens touching each other or whether the two halves of the back are touching when the device is closed, leaving the screens exposed.
source: USPTO via VentureBeat