Although Microsoft"s Surface Duo handset launched to much fanfare in 2019, interest in the series waned due to a relatively poor software experience and Redmond"s deprioritization of mobile efforts. The lukewarm reception of the Surface Duo 2 eventually led to Microsoft canceling the Surface Duo 3 in 2023. Although we have seen some details about what the Surface Duo 3 could have been through patents, another filing now sheds some light on specific aspects of the handset.
Windows Central has spotted a patent filing, available here, describing a "spring-loaded" hinge mechanism that would have made it easier to open the two displays with one hand. This is a fairly common complaint when it comes to this form factor as you need to use both hands to pry apart the displays. It seems Microsoft intended to solve this problem by having a button on the side which would slightly open the displays when pressed, making it easier to properly open the device.
The designs in the patent showcase two potential positions for this button: on the device"s spine and next to the power button. Some details about the technical implementation of this spring-loaded hinge mechanism are described below:
A device, comprising: a first portion and a second portion that are rotatably secured relative to a hinge axis through a range of rotation from an open orientation to a closed orientation; a deployable link that in a first position extends between the first portion and a spring to allow compression of the spring as the first portion and the second portion are rotated toward the closed orientation; and, a trigger that is both configured to transition the deploy able link to a second position that decouples the first and second portions from the compressed spring and to retain the spring compression.
In 2023, we had learned that Microsoft was pivoting to a foldable display device which was reportedly codenamed "Neon". It was slated for a launch window sometime in 2023 or 2024, but we know that those plans eventually fell apart as well. As it currently stands, it seems like Microsoft filed the patent application in 2025 and it was only granted last month. It"s unlikely that we"ll see the firm implement this hinge mechanism in any tangible form in its existing Surface devices, especially considering that it does not offer this form factor anymore.