https://wccftech.com/foldable-surface-special-liquid-hinges/

Foldable devices are considered the next big trend in the industry but it will take some time before manufacturers get it right. Although Samsung and Huawei have already announced their devices, others like Microsoft are taking their sweet time to perfect their designs. According to a recently unearthed patent, the Redmond giant is readying a special type of hinge for its rumored foldable Surface.

As the Galaxy Fold debacle has shown, the hinge is an important part of any foldable device. That seems to be the reason why Microsoft has detailed the hinge structure in its foldable Surface patent. The company has mentioned a reinforcing material that can be placed between the flexible screen and the hinge assembly to provide support for a range of orientations.