CardiacSense v. COROS: Wearable Health Patent Case Stayed Pending IPR

Case Overview

The Parties

The Patent at Issue

U.S. Patent No. 7,980,998 (Application No. 12/382,214) covers technology in the wearable health monitoring space. PTAB’s decision to institute IPR of *all* asserted claims underscores the substantive validity questions surrounding this patent — a critical procedural fact that directly enabled the stay.

• • US 7,980,998 — System and method for continuous vital sign monitoring using wearable biosensors.

The Accused Products: CardiacSense’s infringement allegations centered on COROS’s applications — the software-driven features of COROS’s wearable platform alleged to practice the patented monitoring methodology. The commercial significance is notable: COROS applications are integral to the brand’s competitive value proposition in the sports wearable market.

Litigation Timeline & Procedural History

CardiacSense filed suit in the Central District of California — a well-established venue for technology patent litigation — on December 18, 2024. The case moved swiftly toward a critical juncture: within approximately six months of filing, COROS moved for a stay pending resolution of the Garmin IPR.

The case was at an early procedural stage — no claim construction order or substantive merits rulings had been issued — a fact COROS specifically leveraged in arguing that a stay would cause no prejudice to CardiacSense. The case closed on July 15, 2025, one day after the noticed motion hearing, reflecting a rapid court ruling consistent with well-established stay-pending-IPR jurisprudence in the Central District.

Timeline

The Verdict & Legal Analysis

Outcome

The Central District of California stayed Case No. 2:24-cv-11011 pending resolution of Garmin Int’l, Inc. v. CardiacSense, Ltd., IPR2025-00195 at PTAB. The case is closed at the district court level pending IPR outcome. No damages were awarded, and no injunctive relief was issued. The merits of infringement were not adjudicated.

Verdict Cause Analysis: The Stay Motion

COROS’s motion to stay rested on the three-factor framework courts routinely apply when evaluating stay requests pending IPR:

1. Simplification of Issues. PTAB instituted review of *all claims* of the ‘998 Patent asserted in the litigation. This is the most powerful factor favoring a stay — if PTAB cancels or amends even some claims, the district court litigation scope narrows substantially. A complete institution decision removes any argument that the IPR covers only peripheral claims.

2. Stage of Litigation. COROS correctly characterized the case as being “in its infancy.” No significant discovery had occurred, no claim construction briefing was complete, and no trial schedule had been set. Courts consistently hold that early-stage litigation weighs heavily in favor of granting stays, avoiding investment of judicial and party resources on claims that may not survive PTAB review.

3. Undue Prejudice to Plaintiff. COROS argued that CardiacSense would suffer no undue prejudice from a stay. Notably, the IPR petitioner was Garmin — a non-party to the district court case. This structural fact is strategically significant: COROS could not have filed the IPR itself without triggering estoppel considerations under 35 U.S.C. § 315(e), but benefited from Garmin’s petition without bearing that risk.

Legal Significance: Third-Party IPR as a Defense Shield

The most precedentially instructive element of this case is the use of a competitor’s IPR petition as a litigation defense tool. Under current USPTO and Federal Circuit practice, any party can benefit from a PTAB institution decision — even non-petitioners — when seeking a district court stay. COROS’s strategy of leveraging Garmin’s IPR2025-00195 to stay its own litigation demonstrates a sophisticated, cost-efficient defense posture.

This approach avoids the estoppel risk that COROS would have faced had it filed its own IPR petition and subsequently lost at PTAB. Under § 315(e)(2), a petitioner who receives a final written decision is estopped from raising in district court any invalidity ground it “raised or reasonably could have raised” during IPR. By riding Garmin’s petition, COROS preserved its invalidity defenses while still obtaining a stay.