Oura sues rival Ultrahuman again, threatening its U.S. smart ring comeback

Smart ring maker Oura has sued Indian rival Ultrahuman again, seeking to block U.S. sales of its Ring Pro (pictured above) just months after the redesign helped the Bengaluru-based startup return to the American market following an import ban. The case is the latest in a string of patent disputes Oura has brought against competing smart-ring makers, including Samsung and RingConn.

In a complaint filed Thursday in a federal court in Texas, Oura alleged that Ultrahuman’s Ring Pro infringes two…