Microsoft’s MR headset, HoloLens, is facing complications after Connecticut-based HoloTouch claimed that the tech giant ‘willfully’ ignored its holographic imaging patents, despite acknowledging the HoloTouch’s patents as 'prior art'.

In the lawsuit, the patents are detailed as, “Means by which an operator may control one or more devices without touching a solid control object or surface while still interacting with controls that are visually perceived, such as a keyboard.”

The second patent involves an input interface that, “Permits the operator to input data and commands into a device… without requiring physical contact.”

The company claims in the lawsuit that it approached Microsoft for a partnership as early as 2006, then again in 2015 and 2016 to discuss a licensing agreement for the patents, but Microsoft did not respond. The tech giant filed its own patent for the HoloLens in 2013.

Microsoft has not yet responded to the lawsuit.