India, Aug. 23 -- Healthtech major Ultrahuman has filed a patent infringement case against Finland-based smart ring maker Oura Health Oy and its US unit Ouraring Inc in the Delhi High Court.

In its petition, Ultrahuman has alleged that Oura's latest device, Ring 4, uses the former's architecture and features without authorisation.

The said patent pertains to a layered ring structure (with sensors for heart rate, temperature, and motion) and a microcontroller for processing data related to sleep stages and readiness scores.

The Bengaluru-based company has also alleged that Oura copied its innovations, including women's health features and circadian health tools, and placed these offerings behind a paywall.

Responding to the lawsuit, an...