This might be Microsoft's secret Surface notepad

Microsoft has been rumored to be working on a foldable notepad-like device, much like the company’s Courier concept. A patent from earlier this year provided an outline for such a device, but a new patent has emerged this week with a lot more detail. The patent references a “hinged device,” and has been filed by Microsoft Surface engineers that are responsible for creating various Surface hinges and devices.
The device appears to have two separate screens and sections that fold