In a case that concluded swiftly after just 153 days, Contego Spa Designs, Inc.’s patent infringement action against Soho Nails Spa LLC ended in a joint stipulation of dismissal without prejudice on August 15, 2024. Filed in the Missouri Western District Court under Case No. 4:24-cv-00183, the dispute centered on U.S. Patent No. US9289353B2, covering pedicure spa chair technology marketed under the T-Spa MFG brand. Chief Judge Howard F. Sachs ordered the case dismissed with each party bearing its own costs and fees, leaving the underlying infringement claims unresolved on the merits.

The dismissal without prejudice carries meaningful strategic implications for IP practitioners in the nail salon equipment and spa products sector. Because the case was never adjudicated on the merits, Contego retains the right to refile its claims, and the patent’s validity remains unchallenged in this proceeding. Companies operating in the pedicure spa chair and salon equipment market should treat this outcome as an active signal — the asserted patent remains enforceable, and future litigation against alleged infringers remains a live possibility.

Case Overview

The Parties

The Patent at Issue

U.S. Patent No. US9289353B2 (Application No. US13/795862) covers innovations in pedicure spa chair design and construction, specifically relating to the systems and structures used in professional nail salon spa chairs — products sold under the T-Spa MFG brand. The patent likely encompasses key aspects of the chair’s hygienic basin systems, structural components, or integrated plumbing features that differentiate professional-grade pedicure equipment. These inventions are directly applicable to commercial nail salon operations where pedicure spa chairs are a central operational asset.

• • US9289353B2

Legal Representation

Plaintiff Counsel: Lasher Holzapfel Sperry & Ebberson; Vista IP Law Group LLP (lead: Aaron Schwartz)
Defendant Counsel: Polsinelli PC (lead: Clement A. Asante)

Litigation Timeline & Procedural History

This case was filed on March 15, 2024, in the Missouri Western District Court, a federal venue with general jurisdiction over patent infringement matters under 28 U.S.C. § 1338. The plaintiff’s choice of Missouri — rather than a traditionally patent-heavy venue such as the Western District of Texas or the District of Delaware — suggests the defendant, Soho Nails Spa LLC, likely operates or has a principal place of business within that district, grounding venue in the defendant’s geographic presence rather than plaintiff forum shopping.

The case closed in just 153 days — a remarkably short lifespan for patent litigation, which typically spans multiple years through claim construction and trial. The resolution via a joint stipulation of dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(ii) indicates that both parties mutually agreed to end the litigation without any court adjudication of the merits. This procedural mechanism, requiring no court order beyond acknowledgment, strongly implies the parties reached a private resolution — potentially a licensing agreement, a settlement, or a commercial arrangement — though no terms were publicly disclosed. No damages, injunctions, or claim constructions were issued.

The Verdict & Legal Analysis

Outcome

The case was dismissed without prejudice pursuant to a joint stipulation filed by both parties under Fed. R. Civ. P. 41(a)(1)(A)(ii), with Chief Judge Howard F. Sachs ordering each party to bear its own costs and fees. No damages were awarded, no injunctive relief was granted, and no ruling on patent validity or infringement was issued. Because the dismissal is without prejudice, Contego Spa Designs retains the full legal right to refile its infringement claims against Soho Nails Spa or related Does 1–10 defendants in a future action.

Verdict Cause Analysis

The infringement action’s termination by joint stipulation — rather than by motion to dismiss, summary judgment, or trial — reflects the following key procedural and strategic realities:

• A joint stipulation of dismissal under Rule 41(a)(1)(A)(ii) requires agreement from all parties who have appeared, signaling that Soho Nails Spa’s counsel at Polsinelli PC participated affirmatively in the resolution rather than contesting the dismissal.
• The ‘without prejudice’ designation preserves Contego’s cause of action entirely, meaning no estoppel, res judicata, or claim preclusion attaches — the patent infringement claims survive legally intact for potential future enforcement.
• The fee allocation — each party bearing its own costs — is typical of privately negotiated resolutions and deliberately avoids any court finding of exceptional case status under 35 U.S.C. § 285, which would have required a prevailing party determination.
• The inclusion of Does 1–10 as defendants, left unresolved, suggests Contego may have been investigating additional parties allegedly involved in infringement, and this dismissal does not foreclose claims against those unnamed individuals or entities.

Legal Significance

1. 1. The dismissal without prejudice leaves US9289353B2 unscathed — no validity challenge, claim construction ruling, or invalidity finding was made, meaning the patent retains its full presumption of validity under 35 U.S.C. § 282 and remains a potent enforcement asset.
2. 2. The rapid resolution in 153 days, combined with mutual cost-bearing, is consistent with a licensing resolution pattern frequently employed by patent holders in the salon equipment sector to efficiently monetize patents across a broad field of small business operators without prolonged litigation costs.
3. 3. For pending or future cases involving US9289353B2, this dismissal provides no adverse precedent — there is no claim construction, no prosecution history estoppel from litigation, and no judicial commentary on the scope or validity of the asserted claims.

Strategic Takeaways

For Patent Attorneys:

• When filing infringement actions against small business operators in niche product markets, a Missouri district court filing with Rule 41(a)(1)(A)(ii) voluntary dismissal as an exit ramp can enable efficient licensing resolution without costly discovery or Markman proceedings.
• The absence of a fee-shifting motion or exceptional case finding under 35 U.S.C. § 285 protects both parties’ reputations and preserves the ability to negotiate future licenses across the defendant’s industry sector without litigation stigma.
• Counsel should advise patent holder clients that dismissals without prejudice in cases like this preserve all future enforcement rights — but the statute of limitations for damages (6 years under 35 U.S.C. § 286) continues to run, requiring timely refiling if no settlement is reached.
• Including Doe defendants in the original complaint is a strategically sound practice when the full scope of infringing parties is unknown at filing, preserving the ability to add named defendants as discovery would have revealed additional actors.

For IP Professionals:

• In-house teams monitoring the spa and salon equipment IP landscape should note that US9289353B2 remains an active, unchallenged enforcement asset — companies in the pedicure spa chair supply chain should conduct FTO analysis before expanding product lines or entering the U.S. market.
• The speed and mutual nature of this resolution suggests Contego Spa Designs may be executing a systematic licensing campaign across small salon businesses; IP teams at industry distributors and equipment suppliers should proactively audit their supply agreements for indemnification provisions covering this patent family.

For R&D Teams:

• Engineering and product teams developing or sourcing pedicure spa chairs for the U.S. market must treat US9289353B2 as an active blocking patent — design-around analysis should be completed before commercialization, focusing on the patent’s core claims regarding basin systems, structural configurations, or plumbing integration.
• Given that no claim construction was issued in this case, the scope of US9289353B2’s claims remains undefined by any court — R&D teams should obtain a formal FTO opinion from patent counsel based on the patent’s intrinsic record and prosecution history before launching competing products.