In response to a lawsuit initiated by Oura, smart ring manufacturer Ultrahuman has launched a counter-lawsuit, alleging a similar infringement. Ultrahuman, which provides health and fitness tracking capabilities comparable to those of its competitor, filed a patent infringement case against the Finland-based Oura in the Delhi High Court of India on Thursday.

“Without authorization, Oura has unmistakably replicated Ultrahuman’s sophisticated intellectual property, including features for women’s health, tools for circadian health, and a platform for glucose monitoring, thus capitalizing on Ultrahuman’s investment in public health,” Ultrahuman declared in a press release regarding the lawsuit.

This represents the most recent update in the ongoing legal battle within the smart ring sector.

Previously, Oura had filed a patent infringement lawsuit against Ultrahuman and RingConn in the United States, accusing the rivals of copying essential elements like its curved battery design and advanced sensors. Oura asserts that its competitors acquired Oura rings in order to reverse engineer them. The U.S. International Trade Commission (ITC) initially sided with Oura’s claims of infringement, although a conclusive decision is yet to come.

Earlier this year, Ultrahuman contended that specific smart ring components have been around for many years and that Oura merely recently obtained the patent to confront its competitors. “This isn’t a conflict over years of clandestine research and development,” Ultrahuman expressed in a blog entry concerning the lawsuit. “It’s regarding a very recent patent acquisition now being used to restrict the options available to ring-wearers like you…”

The lawsuit filed by Ultrahuman against Oura centers on a patent awarded by the India Patent Office, which the company asserts safeguards the distinctive architecture of its Ring AIR smart ring. It accuses Oura’s Ring 4 of violating this patent by imitating these protected components and profiting from them via a subscription model.

“Entities that imitate Ultrahuman’s innovations merely to confine them behind obligatory subscriptions are detrimental to innovation and consumers,” the press release added.

Oura had not replied to Mashable by the time this was published.