A Nokia design patent, filed back in December 2011, appears to have revealed a possible future Lumia Windows Phone. Discovered by LiveSide, the patent shows a phone design that was previously spotted in a leaked Nokia Lumia concept video. The device has a shaped and angled back with room for capacitive buttons at the front of the display.

There's no indication that this is a handset that will be unveiled at Mobile World Congress, but Nokia previously patented its Lumia 920 design back in December 2011 before unveiling it late last year. We're expecting to see at least one new Lumia device in Barcelona later this month, with Nokia planning the Laser, EOS, and Catwalk devices for 2013.