Monthac v. Reintech: Clean Room Partition Patent Appeal Partially Granted
Monthac Montagens brought an infringement action against Reintech Indústria over utility model patent BRMU8903444Y1, covering specialised glass partition profiles for clean room construction. The Court of Justice of São Paulo partially granted Monthac’s appeal on 29 October 2024, suggesting the lower court’s ruling was revised in the patent holder’s favour on at least some claims.
São Paulo court revises clean room patent ruling on appeal
Monthac Montagens, Desenhos e Projetos Ltda – ME initiated an infringement action against Reintech Indústria de Equipamentos e Produtos para Controle da Contaminação Ltda. before the courts of São Paulo, Brazil (Case No. 1030952-62.2020.8.26.0577). The dispute centred on utility model patent BRMU8903444Y1, which covers a special profile system incorporating glass partitions used in the construction of clean rooms — controlled environments critical to pharmaceutical, semiconductor, and biomedical manufacturing.
On 29 October 2024, the Court of Justice of São Paulo issued a ruling that partially granted Monthac’s appeal, revising the prior determination on at least some of the contested issues. A partial grant at the appellate level typically signals that the lower court’s findings were upheld in some respects but corrected or overturned in others — though the specific scope of what was granted and what was denied is not fully disclosed in the available public record.
Because the filing date is not recorded in the available public data, the full duration of proceedings cannot be determined. The partial nature of the appellate outcome suggests the infringement and relief questions were contested on multiple fronts simultaneously. What specific remedies, if any, were awarded to Monthac as a result of the partial grant remains unclear without access to the full judicial decision.
Filing to Appeal Granted In Part in 0 days
Case closed 29 October 2024 — filing date not available in public record
Appeal partially granted: what the São Paulo ruling means for both parties
What ‘partially granted’ means at appellate level
A partial grant of appeal means the reviewing court found reversible error in the lower decision on at least one ground, while leaving other aspects of that decision intact. Neither party achieves a complete win. The appellate court reformulates the outcome in a way that splits the contested issues — typically affirming findings it considers correct and correcting those it does not. The specific scope of correction is determined by the operative part of the ruling.
Partial appellate correctionMonthac secures partial appellate relief on clean room patent
A partially granted appeal is a qualified win for Monthac as the appellant. It suggests the Court of Justice of São Paulo agreed with Monthac on at least some of its arguments — whether relating to infringement findings, scope of the utility model, or remedies. However, because the grant is only partial, Monthac did not prevail on every argument it raised. The enforceability of BRMU8903444Y1 is not extinguished, and the partial revision may strengthen Monthac’s position in any subsequent enforcement steps.
Partial win for patent holderReintech faces revised liability on at least some issues
For Reintech, the partial grant means the lower court’s determination was not fully upheld in its favour. Reintech likely retained some protection on grounds where Monthac’s appeal was rejected, but faces a revised legal position on the issues where the appeal succeeded. Depending on the scope of what was granted, Reintech may face injunctive exposure, damages liability, or other relief ordered on remand. The absence of a full reversal, however, means Reintech is not without any successful arguments in this litigation.
Partial adverse outcomeClean room construction sector: IP enforcement precedent reinforced
This case signals that utility model rights in Brazil’s clean room and contamination control sector are actively enforced at appellate level. Competitors and integrators supplying glass partition profile systems for clean rooms should treat BRMU8903444Y1 as a live enforcement risk. A partial appellate win for the patent holder, even without full reversal, typically emboldens further enforcement action and may deter design-around strategies that do not clearly step outside the utility model’s protected scope.
Active enforcement riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | MONTHAC MONTAGENS, DESENHOS E PROJETOS LTDA – ME | Individual | Clean room construction and design firm — holder of BRMU8903444Y1Search in Eureka ↗ |
| Defendant | REINTECH INDUSTRIA DE EQUIPAMENTOS AND PRODUTOS PARA CONTROLE DA CONTAMINAÇÃO LTDA. | Individual | Manufacturer of equipment and products for contamination control in clean environmentsSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Justice of Sao PauloSearch in Eureka ↗ |
Official order — verbatim text
The appellate court’s ruling — ‘I PARTIALLY GRANT the appeal filed, in the terms mentioned above’ — is a split operative disposition. In Brazilian civil procedure, a partial grant at the Court of Justice level means the collegiate chamber found merit in some but not all of Monthac’s grounds of appeal, revising the first-instance judgment accordingly. The phrase ‘in the terms mentioned above’ incorporates the ratio from the body of the opinion, which is not reproduced in the available public record. For Reintech, this creates revised exposure on the granted issues while preserving any first-instance determinations the appellate court left undisturbed.
BRMU8903444Y1 — special glass partition profile for clean room construction
BRMU8903444Y1 is a Brazilian utility model registration — a form of industrial property protection under Brazilian IP Law (Law No. 9,279/1996) that protects the practical form or arrangement of an object that brings a functional improvement. This registration covers a special profile system incorporating glass partitions specifically designed for the construction of clean rooms. Clean rooms are tightly controlled environments used across pharmaceutical manufacturing, semiconductor fabrication, biotechnology, and medical device production, where particulate and microbial contamination must be rigorously managed.
The commercial significance of this utility model lies in the specificity of its application. Glass partition profile systems for clean rooms must satisfy stringent hygiene, sealing, and structural requirements that differ fundamentally from standard architectural glazing. A utility model protecting a particular profile configuration in this niche creates a meaningful barrier to imitation. For Reintech — a company whose core business is contamination control equipment — this patent sits squarely within its product development perimeter, which likely explains why the dispute escalated to appellate level.
Should you run an FTO against BRMU8903444Y1?
Any company manufacturing, importing, or installing glass partition profile systems intended for clean room applications in Brazil should treat BRMU8903444Y1 as a live FTO concern. This case demonstrates that the patent holder is willing to litigate through to the appellate level and has achieved partial success in those proceedings. Contamination control equipment suppliers, clean room integrators, and construction product distributors active in the Brazilian market are the highest-risk categories.
PatSnap Eureka’s FTO Search Agent allows R&D and IP teams to map their clean room partition profile designs against the protected scope of BRMU8903444Y1 and related Brazilian utility models. Eureka’s claim analysis tools can surface design-around opportunities, identify relevant prior art, and flag related registrations from both Monthac and competing applicants — helping product teams make informed launch decisions before entering the Brazilian clean room construction market.
Run a freedom-to-operate analysis on BRMU8903444Y1 to assess your product’s exposure
Run FTO in Eureka →Similar clean room construction patent infringement cases in Brazil
Cases involving utility model infringement of construction and contamination control profiles before Brazilian state courts and the Court of Justice of São Paulo.
What this case signals for the clean room construction IP landscape
Utility model enforcement in Brazil’s clean room sector is viable at appellate level — this case confirms São Paulo courts will intervene.
Brazilian utility models in construction are actively enforced at appeal
Monthac’s partial appellate success demonstrates that Brazilian utility model patents covering specialised construction profiles are not merely defensive filings. Competitors in the clean room fit-out and contamination control supply chain should audit their product lines against BRMU8903444Y1 and similar rights before entering this market segment.
Partial grants signal multi-issue disputes — scope matters
The partial nature of this appellate outcome is consistent with disputes where both infringement and remedy questions are independently contested. For in-house IP teams, this underscores the importance of addressing each claim element and each head of relief separately in Brazilian infringement proceedings rather than relying on a single dispositive argument.
ME v REINTECH — key questions answered
The Court of Justice of São Paulo partially granted Monthac’s appeal on 29 October 2024. The lower court’s decision was revised on at least some grounds, though the specific scope of the partial grant is not fully detailed in the publicly available record.
The patent at issue is BRMU8903444Y1, a Brazilian utility model registration covering a special profile system with glass partitions designed for the construction of clean rooms. Monthac Montagens is the registered holder of this utility model.
In Brazilian civil procedure, a partial grant of appeal at the Court of Justice level means the appellate chamber found merit in some but not all of the appellant’s grounds. The lower court’s judgment is revised on the granted issues while remaining intact on those not upheld. It is neither a full win nor a full loss for either party.
BRMU8903444Y1 covers a special profile with glass partitions used for the construction of clean rooms. Clean rooms are controlled environments used in pharmaceutical, semiconductor, biotechnology, and medical device manufacturing. Reintech, the defendant, is a manufacturer of equipment and products for contamination control.
Companies supplying glass partition profile systems for clean room construction in Brazil face live FTO risk from BRMU8903444Y1. The Monthac v. Reintech case demonstrates active enforcement through appellate level. Suppliers, integrators, and importers should conduct FTO analysis before commercialising similar profiles in the Brazilian market.
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