Zepp Inc. et al. v. Oura Health Oy

Case Background: Wearable Tech Rivals Clash in Patent Dispute

This patent infringement lawsuit pits two major players in the rapidly growing wearable health technology market against each other. The plaintiffs are Zepp Inc. and its North American subsidiary, Zepp Health, a global company that develops and manufactures a wide range of smart wearable devices, including smartwatches and fitness bands under its Amazfit and Zepp brands. The defendant is Oura Health Oy, a Finnish health technology company renowned for its Oura Ring, a popular smart ring that tracks sleep and physical activity. Both are operating companies that design, market, and sell their own branded consumer electronics, placing them in direct competition. The case is part of a broader series of legal battles in the smart ring sector, with Oura having previously asserted its own patents against Zepp and other rivals. This lawsuit appears to be a counterpunch by Zepp.

The dispute centers on allegations that Oura's flagship products, the Oura Ring Gen 3 and Gen 4, along with the accompanying Oura software application, infringe upon six of Zepp's U.S. patents. These accused products are sophisticated wearable sensors that gather biometric data from the user's finger—such as heart rate, body temperature, and blood oxygen levels—to provide insights into sleep quality, activity, and overall readiness. The asserted patents cover a range of technologies allegedly used in the Oura Rings, including methods for game motion recognition, motion data acquisition, calibrating stride length, sleep monitoring, determining health risks from biometric data, and, specifically for patent '693, a method for determining the measurement confidence from wearable sensors.

Filed in the U.S. District Court for the Eastern District of Texas, the case has been assigned to Judge Rodney Gilstrap, who handles one of the largest patent dockets in the country. The Eastern District of Texas has long been a favored venue for patent plaintiffs due to its local rules, plaintiff-friendly reputation, and tendency to move cases quickly to trial, making it an expensive forum for defendants. Although its dominance was briefly challenged, the district has recently regained its status as the top venue for patent litigation. The case is notable as it represents a significant escalation in the "ring wars" among wearable tech companies. With the smart ring market projected to grow substantially, the outcome of this litigation could have a considerable impact on the competitive landscape by potentially affecting the sale of Oura's core products and shaping the intellectual property licensing environment for the entire wearable technology industry.

Legal Developments in Zepp v. Oura Wearable Tech Dispute

Since its filing on April 21, 2026, the patent infringement lawsuit by Zepp Inc. against Oura Health Oy in the U.S. District Court for the Eastern District of Texas has been in its nascent stages. The case, assigned to Judge Rodney Gilstrap, a prominent figure in patent litigation, represents a strategic countersuit by Zepp in the escalating "smart ring wars."

Initial Pleadings and Posture

• 2026-04-21: Complaint Filed
  Zepp Inc. and its U.S. subsidiary, Zepp North America Inc., filed a complaint for patent infringement against Finnish company Oura Health Oy. The complaint alleges that Oura's Ring Gen 3 and Gen 4 products, along with the Oura software application, infringe on six of Zepp's patents. The patents at issue cover a range of technologies from motion recognition to sleep monitoring and health risk analysis, including U.S. Patent No. 9,729,693, which pertains to determining measurement confidence from wearable sensors. A jury trial was demanded on the same day.

As of early May 2026, the case is in its earliest phase. A summons has been issued for Oura Health Oy, but as of this date, there is no public record of Oura having filed an answer, motion to dismiss, or any other responsive pleading. The court docket reflects only the initial filings by the plaintiff, Zepp.

Broader Litigation Context: The "Smart Ring Wars"

This lawsuit did not arise in a vacuum. It is a direct response to aggressive patent enforcement by Oura against its competitors.

• Prior Oura Lawsuits: In November 2025, Oura initiated its own legal actions, filing lawsuits in the Eastern District of Texas and a complaint with the U.S. International Trade Commission (ITC) against multiple competitors, including Zepp Health, Samsung, and others. Oura's legal strategy has been to leverage its patent portfolio to compel rivals into royalty-bearing license agreements, a tactic that proved successful against companies like RingConn.

• Parallel ITC Investigation (Inv. No. 337-TA-1468): Oura's ITC complaint against Zepp and others accuses them of unlawfully importing and selling devices that infringe Oura's patents. An ITC investigation can move more quickly than district court litigation and can result in an exclusion order, which would bar the importation of infringing products into the U.S. In a related district court case filed by Oura against Zepp (Ouraring Inc. v. Zepp Health Corporation, 2:2025cv01126), the court granted an unopposed motion to stay the case in January 2026 pending the final resolution of the ITC investigation.

Zepp's current lawsuit against Oura appears to be a classic counter-offensive, applying pressure on Oura by alleging that its own flagship products rely on Zepp's patented technology. This mirrors a strategy also employed by Samsung in its own disputes with Oura.

Anticipated Next Steps

Given the early stage of this case, several developments can be expected in the coming months:

1. Oura's Response: Oura Health Oy will be required to file an answer to Zepp's complaint. This response will likely include defenses of non-infringement and patent invalidity, and potentially counterclaims for infringement of Oura's own patents.
2. Pre-Trial Motions: Oura may file preliminary motions, such as a motion to dismiss for failure to state a claim or a motion to transfer venue out of the Eastern District of Texas, though such motions face a high bar in Judge Gilstrap's court.
3. Potential Stay: Depending on the progress and scope of the parallel ITC investigation initiated by Oura, either party might move to stay this case. A stay would pause the district court proceedings to await the outcome of the ITC action, which could narrow the issues in dispute.
4. Claim Construction: Should the case proceed, the parties will engage in the claim construction process, culminating in a Markman hearing where the court will determine the legal meaning of disputed patent terms. Judge Gilstrap's standard orders typically keep cases on a steady timeline toward this critical hearing.
5. PTAB Proceedings: It is also common for defendants in patent litigation to challenge the validity of the asserted patents at the U.S. Patent and Trademark Office's Patent Trial and Appeal Board (PTAB) by filing petitions for inter partes review (IPR). No such proceedings have been publicly noted against the '693 patent by Oura at this time.

The litigation is currently active, and its outcome will likely be influenced by the parallel proceedings and the broader strategic battle for market share and intellectual property dominance in the wearable technology sector.

Plaintiffs' Counsel of Record Identified in Zepp v. Oura Patent Suit

Plaintiffs Zepp Inc. and Zepp North America Inc. are represented by attorneys from the international law firm Jones Day. The legal team brings significant experience in high-stakes patent litigation, particularly in venues like the Eastern District of Texas and the International Trade Commission (ITC). Notices of appearance were filed on April 21, 2026, the same day the complaint was filed.

Based on the docket and attorney profiles, the following counsel have appeared for the plaintiffs:

• David M. Maiorana, Lead Counsel

  • Firm: Jones Day (Cleveland, OH office)
  • Note: A first-chair trial lawyer and former U.S. Patent and Trademark Office (USPTO) examiner with nearly 30 years of experience, Maiorana frequently litigates complex patent cases in district courts and the ITC for major clients like R.J. Reynolds and Goodyear.

• Keith Bryan Davis, Lead Counsel

  • Firm: Jones Day (Dallas, TX office)
  • Note: Davis has over two decades of experience leading patent and trade secret litigation in Texas courts for prominent technology clients such as Qualcomm, IBM, and Texas Instruments. He filed the initial complaint and other opening documents in this case.

The engagement of Jones Day, a firm with a deep bench in intellectual property litigation, signals Zepp's serious intent in this legal confrontation with Oura. The selection of a Dallas-based partner, Keith Davis, satisfies any practical need for local representation in the Eastern District of Texas, while the team is led by prominent patent litigators from the firm's national practice. No separate local counsel from a different firm has appeared on the docket.

Defendant Oura Health Oy's Counsel of Record

As of May 7, 2026, Oura Health Oy has not yet filed a notice of appearance in Zepp Inc. et al. v. Oura Health Oy, Case No. 2:2026cv00316. The complaint was filed on April 21, 2026, and the defendant's response is not yet due.

However, based on Oura's counsel in parallel patent litigation in the same court and before the same judge, the company is consistently represented by a combination of national and local counsel. The legal team defending Oura in a separate case against the same plaintiff (Zepp, under its corporate name Ouraring Inc.) and another competitor, Ultrahuman, provides a strong indication of the attorneys who will likely appear in this matter.

The following firms and attorneys represent Oura Health Oy (or its U.S. entity, Ouraring Inc.) in ongoing patent cases in the U.S. District Court for the Eastern District of Texas and are anticipated to represent the company in this case:

Likely Lead Counsel

The global law firm Mayer Brown LLP has served as lead counsel for Oura in its other patent infringement cases in the Eastern District of Texas.

• Michael L. Lindinger (Partner, Washington D.C.) - An experienced patent litigator who handles complex cases in federal courts and the ITC, with prior experience as a patent examiner at the USPTO.
• Other Mayer Brown Attorneys - A substantial team from Mayer Brown has represented Oura in related matters, including partners Robert Gary Pluta (Chicago), James A. Fussell, III (Washington D.C.), and Bryan Christopher Nese (Washington D.C.), among others.

Likely Local Counsel

Attorneys from a Texas-based firm are required to serve as local counsel in the Eastern District. Oura has consistently retained Patton, Tidwell & Culbertson, a firm with deep experience in the district.

• Geoffrey Patton Culbertson (Partner, Texarkana, TX) - Specializes in intellectual property and complex commercial litigation in Texas federal courts and previously served as a briefing attorney for a judge in the Eastern District of Texas.
• Kelly B. Tidwell (Partner, Texarkana, TX) - An experienced trial lawyer focusing on general, civil, and antitrust litigation in federal and state courts.

Additional Counsel in Other Oura Matters

While Mayer Brown and Patton, Tidwell & Culbertson are Oura's established team in the Eastern District of Texas, the company has also utilized other firms and attorneys for specific, related proceedings, such as Patent Trial and Appeal Board (PTAB) reviews and other district court litigation.

• Shaun W. Hassett (Shareholder, Potter Minton; Tyler, TX) - A patent litigator with extensive experience in the Eastern District of Texas across numerous technology sectors, including telecommunications and computer systems. Mr. Hassett was listed as counsel for Oura in PTAB proceedings in early 2025.
• Matthew T. Wilkerson (Associate, ArentFox Schiff; Chicago, IL) - An intellectual property litigation attorney who has appeared on behalf of Oura in related patent litigation.
• ArentFox Schiff LLP - This firm, including partners Janine A. Carlan and Jasjit S. Vidwan, successfully represented Oura in a major U.S. International Trade Commission (ITC) investigation, securing a victory in April 2025.

This analysis is based on public docket information from highly similar, concurrent cases. The formal appearance of counsel for Oura Health Oy in case 2:2026cv00316 will be confirmed upon their filing with the court.