Husco Automotive v. Stackpole: Hydraulic Valve Patent Suit Ends in Settlement
Husco Automotive LLC and Husco Automotive Holdings LLC brought infringement claims against Stackpole International and Johnson Electric affiliates in Michigan’s Eastern District, asserting two patents covering dual setpoint hydraulic valve and fluid pump pressure regulation technology. The parties reached a private settlement and stipulated to dismissal with prejudice after 491 days of litigation — each side bearing its own costs.
Husco’s Hydraulic Valve Patents Drive Michigan Settlement with Stackpole
Husco Automotive LLC and Husco Automotive Holdings LLC filed suit on June 6, 2023, in the U.S. District Court for the Eastern District of Michigan, asserting infringement of US9582008B2, covering a dual setpoint pressure controlled hydraulic valve, and US8056576B2, covering systems and methods for fluid pump outlet pressure regulation. The defendants named were Stackpole International Engineered Products Ltd, Stackpole Powertrain International USA LLC, Stackpole International Powder Metal Ltd, and Johnson Electric North America Inc — a broad set of entities spanning the Stackpole/Johnson Electric supply chain.
The case closed on October 9, 2024, via a court-ordered dismissal with prejudice, entered on the parties’ stipulation following completion of preliminary settlement terms. The dismissal with prejudice means neither Husco entity can re-file the same infringement claims against the Stackpole/Johnson Electric defendants. Notably, the court retained jurisdiction to enforce the settlement agreement and associated releases, a provision that is standard when parties want judicial oversight of post-settlement compliance without re-filing.
At 491 days, the case resolved before trial — consistent with many automotive-sector patent disputes that settle once core claim construction positions and technical expert positions become clear. The specific financial terms of the settlement remain confidential, as is typical for commercial IP resolutions of this kind. The public record does not disclose licensing royalties, design-around obligations, or any injunctive component, leaving the commercial outcome opaque beyond the confirmed fee-neutral structure.
Filing to Dismissed with Prejudice in 491 days
491 days — moderate duration for a multi-defendant patent dispute at district court level
Dismissed with prejudice: what the settlement structure means for both parties
Dismissal with prejudice forecloses re-litigation of these claims
A dismissal with prejudice entered on stipulation is a final adjudication on the merits for claim-preclusion purposes. Husco cannot re-assert US9582008B2 or US8056576B2 against the named Stackpole/Johnson Electric entities on the accused products litigated here. The court’s retained jurisdiction to enforce the settlement agreement and releases is a separate but significant feature — it gives Husco a fast-track enforcement path without needing to file a new breach-of-contract action.
Settlement with judicial enforcement hookHusco secures a binding resolution — terms remain private
As plaintiff, Husco agreed to dismiss with prejudice, which typically signals it received sufficient consideration — whether monetary, licensing, or design-around commitments — to justify extinguishing its litigation rights. The retention of court jurisdiction is consistent with a structured settlement where ongoing compliance matters. The patents themselves remain active and enforceable against third parties not party to this settlement.
Patents remain live vs. third partiesStackpole/Johnson Electric avoids a merits ruling — at a price
The Stackpole entities and Johnson Electric North America secured dismissal with prejudice — meaning no patent validity ruling, no infringement finding, and no public precedent. This outcome is commercially rational when litigation risk and business disruption costs outweigh settlement consideration. The fee-neutral structure (each party bears its own costs) is consistent with a negotiated compromise rather than a capitulation, and the confidential settlement terms preserve reputational ambiguity.
No validity ruling; confidential termsHydraulic valve IP remains a live enforcement risk for the sector
Husco’s patents covering dual setpoint pressure controlled hydraulic valves and fluid pump outlet pressure regulation are squarely relevant to the broader automotive hydraulic control and electro-hydraulic actuator market. Because no claim construction order or invalidity ruling entered the public record, competitors and suppliers cannot rely on any narrowing of these patent claims. Any automotive powertrain component maker working in this space should treat these patents as fully enforceable at their original scope.
No claim narrowing on public recordFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Husco Automotive, LLC | Company | Automotive hydraulic systems IP holder — asserting US9582008B2 and US8056576B2Search in Eureka ↗ |
| Co-Plaintiff | Husco Automotive Holdings, LLC | Company | Search in Eureka ↗ |
| Defendant | Stackpole International Engineered Products, Ltd | Company | Stackpole International / Johnson Electric group — automotive powertrain components supplierSearch in Eureka ↗ |
| Co-Defendant | Stackpole Powertrain International USA, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Stackpole International Powder Metal, Ltd | Company | Search in Eureka ↗ |
| Co-Defendant | Johnson Electric North America, Inc. | Company | Search in Eureka ↗ |
| Plaintiff counsel | Cynthia J. Haffey | Attorney | Counsel for Husco Automotive, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Daniel George Vivarelli, Jr. | Attorney | Counsel for Husco Automotive, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Mitchell Zajac | Attorney | Counsel for Husco Automotive, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Butzel Long PC | Law Firm | Representing Husco Automotive, LLCSearch in Eureka ↗ |
| Defendant counsel | Matthew E. Sierawski | Attorney | Counsel for Stackpole International Engineered Products, LtdSearch in Eureka ↗ |
| Defendant counsel | Robert Michael Azzi | Attorney | Counsel for Stackpole International Engineered Products, LtdSearch in Eureka ↗ |
| Defendant law firm | Warner, Norcross & Judd LLP | Law Firm | Representing Stackpole International Engineered Products, LtdSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Michigan Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal order tracks the parties’ stipulation precisely, incorporating the with-prejudice bar, the fee-neutral allocation, and — critically — the court’s retained enforcement jurisdiction. This last element elevates the order beyond a standard Rule 41(a)(1) filing: it transforms a private settlement into a court-supervised arrangement, giving either party the ability to seek judicial relief for breach without re-initiating plenary litigation. The absence of any claim construction language or invalidity findings means the public record yields no guidance on patent scope for third parties.
US9582008B2 & US8056576B2 — Hydraulic Valve and Fluid Pump Pressure Control
US9582008B2, filed under application US13/803152, covers a dual setpoint pressure controlled hydraulic valve — a technology enabling precise, programmable pressure thresholds in automotive hydraulic circuits, relevant to transmission, engine lubrication, and active suspension systems. US8056576B2, filed under application US12/198691, covers systems and methods for fluid pump outlet pressure regulation, addressing how pumps manage variable output pressure demands. Both patents sit in the electro-hydraulic control space, which is under active development as automakers pursue efficiency improvements in powertrain and chassis systems.
For automotive Tier-1 and Tier-2 suppliers, these patents represent a meaningful enforcement risk in components that are embedded deep in powertrain and chassis architectures. The dual setpoint valve concept is particularly relevant as OEMs adopt variable pressure hydraulic systems to improve fuel economy and electrification compatibility. Husco’s ability to drive this case to a confidential settlement — without any validity challenge appearing in the public record — suggests the patents withstood at least preliminary scrutiny by sophisticated defence counsel at Warner Norcross & Judd.
Should your team run an FTO against US9582008B2 and US8056576B2?
Any company designing, manufacturing, or supplying dual setpoint hydraulic valves, variable-pressure fluid pumps, or electro-hydraulic pressure control modules for automotive OEMs should treat these two Husco patents as live FTO flags. The settlement’s confidentiality means there is no public narrowing of claims to rely on, and the with-prejudice dismissal confirms Husco actively enforces this portfolio. The Eastern District of Michigan — the heart of the US automotive supply chain — is a natural and credible venue for future enforcement actions.
PatSnap Eureka’s FTO Search Agent allows R&D and IP teams to map claim scope of US9582008B2 and US8056576B2 against your specific component designs, identify prior art that could support an IPR petition if needed, and monitor Husco’s broader patent portfolio for newly published continuations or divisionals that may extend coverage. Running a structured FTO before design finalisation is materially cheaper than defending a district court infringement action in Michigan.
Run a freedom-to-operate analysis on US9582008B2 to assess your product’s exposure
Run FTO in Eureka →Similar Hydraulic Valve & Automotive Powertrain Patent Cases
Explore comparable patent infringement actions involving hydraulic control and fluid pump technology in the Eastern District of Michigan and related automotive IP forums.
What this case signals for the automotive hydraulic systems IP landscape
Husco’s willingness to litigate — and Stackpole’s decision to settle — reveals live enforcement dynamics in automotive hydraulic valve and pressure control IP.
Dual-patent assertion amplifies settlement pressure on defendants
Asserting both US9582008B2 (hydraulic valve) and US8056576B2 (fluid pump pressure regulation) simultaneously forces defendants to mount parallel invalidity and non-infringement defences across two claim sets. This strategy raises litigation cost for defendants and is consistent with Husco achieving a negotiated resolution before trial.
Court-retained jurisdiction signals structured, ongoing settlement obligations
The explicit retention of jurisdiction to enforce the settlement agreement suggests the parties agreed to performance obligations extending beyond a lump-sum payment — potentially royalty streams, product modifications, or supply-chain transitions. Patent attorneys advising on similar deals should consider whether judicial oversight is preferable to arbitration clauses.
Husco v Stackpole — key questions answered
Husco Automotive asserted two patents: US9582008B2, covering a dual setpoint pressure controlled hydraulic valve, and US8056576B2, covering systems and methods for fluid pump outlet pressure regulation. Both relate to automotive electro-hydraulic pressure control technology.
The case was resolved through a private settlement and dismissed with prejudice on October 9, 2024, pursuant to a stipulation by both parties. Each party bears its own attorneys’ fees and costs. The court retained jurisdiction to enforce the settlement agreement and related releases.
Dismissal with prejudice is a final judgment on the merits for claim-preclusion purposes. Husco cannot re-file the same infringement claims under US9582008B2 or US8056576B2 against the named Stackpole and Johnson Electric entities for the accused products. The patents remain enforceable against other third parties.
The court’s retention of jurisdiction to enforce the settlement agreement and releases is a deliberate drafting choice that allows either party to seek judicial relief for breach of the settlement without filing a separate breach-of-contract action. It typically signals the settlement includes ongoing obligations — such as payment schedules, licensing terms, or product modification commitments — rather than a one-time lump sum.
Yes. The settlement and with-prejudice dismissal bind only the named defendants — Stackpole International entities and Johnson Electric affiliates. No invalidity ruling entered the public record. Both patents remain active and fully enforceable by Husco against any third party not covered by the settlement and releases.
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