On March 5, 2021, M-Red Inc. filed a Complaint for Patent Infringement against Mitsubishi Electric Corporation.
M-Red is an affiliate of Quest.
The Complaint was filed in the US District Court for the Eastern District of Texas and the Case Number is 2:21-cv-00075.
You can access a copy of the Complaint at the link below.
Link to M-Red v Mitsubishi Complaint.