It claims Ultrahuman's Ring Pro violates two separate patents, including a brand new one.

Daniel Cooper for Engadget

Last year, Oura successfully sued Ultrahuman and got a court to block sales of its Ring Air product in the US. Now, Oura has sued Ultrahuman again in a Texas federal court over its latest product, the Ring Pro , saying it violates two of its patents involving design and internal components, according to a Oura's blog post . Oura is seeking monetary damages and wants to (again) stop Ultrahuman from selling its latest wearable.

"After it was found to be infringing Oura patents, Ultrahuman recently introduced a modified version of its ring, claiming its redesign no longer infringed our patents. That claim is false.…