MiBev v. A.O. Smith: Water Filtration Patent Dismissed With Prejudice

Case Overview

The Parties

The Patent at Issue

This case centered on **U.S. Patent No. 11,235,267B1** (Application No. 16/905,640), covering innovations in water treatment technology. The patent’s claims appear directed at filtration system configurations or methods used in consumer-grade water purification equipment.

• • US 11,235,267B1 — Innovations in water treatment technology

Litigation Timeline & Procedural History

MiBev filed its complaint on April 9, 2024, in the Western District of Texas — a jurisdiction that, despite post-*Waco* administrative order adjustments, remains a plaintiff-favored venue for patent litigation due to its experienced bench and established IP docket infrastructure.

The case was presided over by Chief Judge David Alan Ezra. The litigation concluded 339 days after filing, on March 14, 2025, significantly faster than the national median for patent cases. No publicly docketed Markman (claim construction) hearing or summary judgment rulings appear prior to the stipulated dismissal, suggesting the parties reached a resolution during the pre-claim-construction phase.

The Verdict & Legal Analysis

Outcome

On March 14, 2025, Chief Judge Ezra granted the parties’ joint Stipulation to Dismiss. The court ordered:

• MiBev’s infringement claims against A.O. Smith regarding U.S. Patent No. 11,235,267 dismissed WITH prejudice.
• A.O. Smith’s counterclaims of non-infringement and invalidity dismissed WITHOUT prejudice.
• Each party bears its own attorneys’ fees, costs, and expenses.

No damages were awarded, and no injunctive relief was issued.

Verdict Cause Analysis

The stipulated dismissal — particularly the **with-prejudice** treatment of plaintiff’s claims — signals that MiBev permanently surrendered its right to re-assert U.S. Patent No. 11,235,267 against A.O. Smith on the accused Aquasana Clean Water Machine. This is a functionally final adjudication of the plaintiff’s position, even absent a merits ruling.

Conversely, A.O. Smith’s counterclaims (non-infringement and invalidity) were dismissed **without prejudice**, preserving A.O. Smith’s ability to revive those claims in future proceedings. The **fee-bearing structure** — each party absorbing its own costs — indicates no finding of exceptionality under **35 U.S.C. § 285**, and no evidence of bad faith litigation.

Legal Significance

This resolution highlights that **Pre-Markman resolution** is increasingly common in patent cases involving assertion entities facing well-resourced defendants with robust invalidity counterclaims. Early claim mapping often reveals vulnerability in asserted claims. **Invalidity pressure** likely served as a significant settlement driver for MiBev. No established claim construction precedent emerged from this case, limiting its direct precedential impact.

Strategic Takeaways

For Patent Holders: Asserting patents against large, well-resourced defendants with established IP defense teams requires thorough pre-suit claim mapping. Pre-suit **FTO analysis** and patent prosecution quality directly affect litigation leverage.

For Accused Infringers: A.O. Smith’s strategic filing of invalidity counterclaims — and their preservation without prejudice — demonstrates effective defense architecture. Retaining invalidity rights post-dismissal maintains future optionality while resolving immediate litigation cost exposure.