https://www.techradar.com/news/microsofts-extending-screen-patent-gives-us-renewed-hope-of-folding-smartphones

The promise of bending, folding, flexible smartphones is yet to be fully realized, but a new patent from Microsoft gives us fresh hope of exciting form factors in the future.

The patent application for a 'flexible display extendable assembly' was originally filed way back in January 2016, but it's only come to light now after being published by the U.S. Patent and Trademark Office, and getting spotted by WindowsLatest.