Smart ring company Oura has sued its competitor, Circular. Both companies offer wearables that can track your health, measuring your breathing rate and body temperature, among other metrics. A document explains that Oura believes Circular has infringed on two of its patents relating to the gadget's design and technology.
https://www.notebookcheck.net/Oura-has-sued-rival-smart-ring-company-Circular-for-patent-infringement.619815.0.html