Paques Brasil v. Acquadom: Wastewater Treatment Patent Appeal Dismissed
Paques Brasil, holder of two Brazilian patents covering biological effluent purification and three-phase separation technology, brought an infringement action against Acquadom Engenharia e Construção. The Court of Justice of São Paulo dismissed the appeal, closing the case on 12 November 2024 and leaving the lower court’s outcome intact.
Brazilian wastewater IP dispute ends at appellate level without merits ruling
Paques Brasil Sistemas para Tratamento de Efluentes Ltda, a specialist in biological effluent treatment systems, initiated an infringement action against Acquadom Engenharia e Construção Ltda before the Brazilian courts. The dispute centred on two patents — BRPI9712753A, relating to equipment for the biological purification of residual water, and BRPI0203537B1, covering a three-phase separator and installation for biological purification of effluent. Both patents represent core technology in the industrial and municipal wastewater treatment sector.
The case was resolved when the Court of Justice of São Paulo dismissed the appeal, recorded under case number 1.022.367-74.2021.8.26.0451 and closed on 12 November 2024. A dismissed appeal at this level typically means the appellate court found a procedural or jurisdictional bar to hearing the merits, leaving the lower court’s position effectively undisturbed. Acquadom, as the party whose appeal was dismissed, exhausted this avenue of challenge without obtaining a substantive reversal.
The public record does not disclose the specific grounds on which the appeal was dismissed — whether procedural non-compliance, standing issues, or another bar — which limits conclusions about the underlying merits. The filing date is not recorded in the available data, making it impossible to assess total litigation duration. What is clear is that Paques Brasil’s patent portfolio survived this appellate challenge without adverse appellate merits ruling, which may strengthen its enforcement posture in future disputes involving the same technology.
Filing to Appeal Dismissed in 0 days
Case closed 12 November 2024 by the Court of Justice of São Paulo
Appeal dismissed: what the ruling means for both parties
Appeal dismissal ends the case without a merits ruling
When an appellate court dismisses an appeal, it typically means the court declined to examine the underlying legal questions on the merits — often due to procedural deficiencies, untimely filing, lack of standing, or failure to satisfy admissibility requirements. In Brazilian civil procedure, a dismissed appeal (recurso não conhecido) leaves the lower court’s decision in force. No finding on patent validity or infringement was issued at this appellate stage.
Procedural dismissal — no merits adjudicatedPaques Brasil’s patents remain unchallenged on appeal
For Paques Brasil, the dismissal is commercially favourable: the appellate court did not reverse or modify any lower court outcome, and neither patent — BRPI9712753A nor BRPI0203537B1 — was invalidated or narrowed through this proceeding. The patents retain their enforceability as recorded before this appeal. Paques Brasil may continue to rely on these rights in licensing negotiations or future enforcement actions against other parties in the wastewater treatment sector.
Patents survive appellate challengeAcquadom’s appeal closed without substantive relief
Acquadom did not obtain a merits ruling in its favour. With the appeal dismissed, the lower court’s position stands and Acquadom’s avenue of challenge at this level is exhausted. Any further challenge would require a distinct procedural route — such as a special appeal (recurso especial) to the Superior Tribunal de Justiça — subject to strict admissibility criteria. The risk of continued exposure to Paques Brasil’s patent portfolio persists unless a separate invalidity or nullity action is pursued.
No appellate relief obtainedEffluent treatment IP holders gain precedential comfort
For companies operating in biological wastewater treatment and three-phase separation technology in Brazil, this outcome suggests that patent enforcement actions can survive appellate challenge even when a defendant pursues full appeal. Competitors deploying similar anaerobic or three-phase biological treatment systems should treat Paques Brasil’s patent portfolio as an active risk factor. Freedom-to-operate analysis against BRPI9712753A and BRPI0203537B1 is advisable before commercial deployment in the Brazilian market.
FTO review recommended for sector peersFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | PAQUES BRASIL SISTEMAS PARA TRATAMENTO DEEFLUENTES LTDA | Individual | Biological effluent treatment systems company — holder of BRPI9712753A and BRPI0203537B1Search in Eureka ↗ |
| Defendant | ACQUADOM ENGENHARIA AND CONSTRUÇÃO LTDA | Individual | Brazilian engineering and construction firm specialising in water and effluent infrastructureSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Justice of Sao PauloSearch in Eureka ↗ |
Official order — verbatim text
The verdict phrase ‘the appeal is dismissed’ is a procedural termination: the Court of Justice of São Paulo declined to adjudicate the appeal on its merits, leaving the lower court’s outcome undisturbed. In Brazilian appellate procedure, this outcome (non-conhecimento do recurso) does not constitute a finding on patent validity or infringement. Neither party obtained a substantive ruling on the underlying claims of BRPI9712753A or BRPI0203537B1, which means the patents’ scope and validity remain untested at this appellate stage.
BRPI9712753A & BRPI0203537B1 — biological wastewater purification systems
BRPI9712753A covers equipment for the biological purification of residual water — technology that sits at the core of industrial and municipal wastewater management, encompassing reactor design and biological treatment processes. BRPI0203537B1 covers a three-phase separator and a broader installation for biological effluent purification, protecting the separation of gas, liquid, and solid phases in anaerobic digestion systems. Both are Brazilian national-phase patents and represent established IP with granted status (B1 designation on BRPI0203537B1 confirms grant), suggesting they predate significant market consolidation in this technology area.
Three-phase separation and anaerobic biological treatment are foundational technologies in the effluent treatment sector, used in food processing, pharmaceutical manufacturing, and municipal water utilities. Paques Brasil’s dual-patent position creates overlapping protection across equipment design and system installation, making design-arounds technically complex. Competitors deploying UASB (Upflow Anaerobic Sludge Blanket) reactors or similar configurations in Brazil face the highest exposure and should conduct targeted claim-by-claim FTO analysis before product launch or contract bid.
Should your team run an FTO against BRPI9712753A and BRPI0203537B1?
Any engineering firm, EPC contractor, or equipment manufacturer deploying biological effluent treatment systems or three-phase separators in Brazil should treat these two patents as live FTO risks. The outcome of this case — dismissal of appeal without merits ruling — means neither patent has been invalidated. Companies bidding on wastewater infrastructure contracts in São Paulo state or other Brazilian jurisdictions are particularly exposed if their designs incorporate anaerobic reactor or phase-separation elements covered by these claims.
PatSnap Eureka’s FTO Search Agent can map the independent and dependent claims of BRPI9712753A and BRPI0203537B1 against your product’s technical specifications, flagging overlap risk and identifying prior art that may support a future invalidity argument. Eureka also tracks the litigation history of both patents and monitors new INPI filings by Paques Brasil, giving your IP team early warning if additional enforcement activity is initiated in the biological wastewater purification space.
Run a freedom-to-operate analysis on BRPI9712753A to assess your product’s exposure
Run FTO in Eureka →Similar wastewater treatment patent disputes at Brazilian courts
Explore comparable biological effluent and three-phase separation patent infringement cases litigated before Brazilian state and federal courts.
What this case signals for the Brazilian wastewater treatment IP landscape
A dismissed appeal in a biological effluent patent case reinforces the enforcement weight of established Brazilian wastewater treatment patents.
Established wastewater patents remain durable enforcement tools in Brazil
The dismissal of Acquadom’s appeal without a merits reversal confirms that Paques Brasil’s patents withstood a full appellate challenge. For patent holders in the Brazilian effluent treatment space, this case suggests that well-drafted, long-standing patents — particularly those covering three-phase biological systems — carry meaningful litigation leverage.
Procedural dismissals leave room for alternative invalidity routes
Because the appeal was dismissed on procedural rather than merits grounds, Acquadom (or any third party) could theoretically pursue a separate nullity action (ação de nulidade) before the federal courts or an administrative challenge at INPI. Companies in similar positions should assess both routes before assuming the patent landscape is definitively settled.
LTDA v ACQUADOM — key questions answered
The Court of Justice of São Paulo dismissed the appeal on 12 November 2024, closing the case without a merits ruling on the underlying patent infringement claims. The lower court’s position was left intact, and neither patent was invalidated at this appellate stage.
Two Brazilian patents were asserted: BRPI9712753A, covering equipment for the biological purification of residual water, and BRPI0203537B1, covering a three-phase separator and installation for biological purification of effluent. Both relate to core wastewater treatment technology.
In Brazilian civil procedure, a dismissed appeal (recurso não conhecido) means the court declined to examine the merits of the case — typically for procedural reasons such as untimely filing, lack of standing, or admissibility failures. The lower court’s decision remains in force. No finding on patent validity or infringement is made at the appellate level.
Potentially. Because the dismissal was procedural rather than on the merits, Acquadom or a third party could pursue a separate patent nullity action (ação de nulidade) in Brazilian federal court or an administrative challenge before INPI. Strict admissibility criteria would apply to any further appeals within the São Paulo court system.
Both patents remain enforceable following this appellate dismissal. Engineering firms deploying three-phase separation, anaerobic digestion reactors, or biological effluent purification systems in Brazil face live infringement risk if their designs fall within the claim scope of either patent. A claim-by-claim FTO analysis is advisable before contract bidding or product deployment in the Brazilian market.
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