Midwest Energy Emissions v. Vistra Energy: Jury Finds Willful Infringement of Mercury Sorbent Patents
Midwest Energy Emissions Corp. and MES, Inc. secured a unanimous jury verdict on March 1, 2024 against CERT-entity defendants for willful induced and contributory infringement of two mercury sorbent patents — US10343114 and US10596517 — after a case spanning more than six years in Delaware federal court.
Six-Year Delaware Battle Over Mercury Emission Control Technology Ends in Plaintiff Verdict
Midwest Energy Emissions Corp. and its affiliate MES, Inc. filed suit in the District of Delaware on July 17, 2019, accusing Vistra Energy Corp. and a large network of coal-related entities — including multiple CERT Operations entities, Dynegy affiliates, NRG Texas Power, AEP entities, Talen Energy, and Arthur J. Gallagher & Co. — of infringing five patents covering sorbent technologies for the oxidation and removal of mercury from coal-fired power plant emissions. The asserted patents include US10343114, US10596517, US10589225, US10668430, and US8168147.
After more than six years of litigation, a jury returned a unanimous verdict on March 1, 2024 finding the CERT-entity defendants liable for induced infringement and willful infringement of claims 25 and 26 of US10343114 and claims 1 and 2 of US10596517. A subset of CERT defendants was also found liable for contributory infringement. Critically, the jury rejected all invalidity challenges to those two patents. Judge Burke entered judgment for the plaintiff, designated Midwest Energy Emissions as the prevailing party entitled to costs, and preserved the right to seek enhanced damages under § 285 following any appeal.
The case’s duration of 2,357 days — roughly 6.5 years — is notably long even for a complex multi-defendant patent case and likely reflects the breadth of the defendant network, the technical complexity of emission-control chemistry, and potential IPR or claim-construction disputes along the way. The public record does not yet disclose the damages quantum; any damages award, enhanced damages motion under § 284 for willfulness, and attorneys’ fees petition under § 285 remain to be resolved post-appeal. The willfulness finding is commercially significant and typically raises the prospect of up to treble damages.
Filing to Judgment on the merits for Plaintiff in 2357 days
2,357 days — well above the median ~730-day district court patent trial cycle
Jury verdict for plaintiff: what willful infringement means for both sides
Unanimous jury verdict: induced, contributory, and willful infringement
The jury found induced infringement and willful infringement against all CERT entities on claims 25–26 of US10343114 and claims 1–2 of US10596517. A subset of CERT entities was additionally found liable for contributory infringement. A willfulness finding opens the door to enhanced damages of up to three times the jury award under 35 U.S.C. § 284, subject to the court’s discretion, and supports an exceptional-case fee motion under § 285.
Willful infringement — § 284 enhancement possiblePatents survive invalidity challenge — enforceability strengthened
The jury’s rejection of all invalidity arguments for US10343114 and US10596517 materially strengthens these patents’ enforceability against the broader market. Midwest Energy Emissions is now the prevailing party entitled to costs and may pursue attorneys’ fees. The willfulness finding provides a strong platform for enhanced damages, and the surviving validity determination applies with full preclusive force against the adjudicated defendants.
Patents valid and infringedCERT entities face enhanced damages exposure and cost liability
The CERT defendants now carry an adverse willful-infringement jury verdict and an invalidity defense that was rejected on the merits — limiting their arguments on remand or in subsequent enforcement actions. They bear the plaintiff’s taxable costs and face potential attorneys’ fees and trebled damages. Appeal to the Federal Circuit remains the principal avenue for reversal, though the appellate standard for overturning a jury verdict is demanding — requiring the appellant to show no reasonable jury could have reached the verdict.
Costs liable; treble damages riskBroad defendant network signals industry-wide mercury sorbent IP risk
With 43+ defendants spanning major power generators and coal-fuel intermediaries, this verdict signals that mercury-sorbent patent exposure is not limited to direct manufacturers. Operators using refined-coal or treated-sorbent programs supplied by CERT-type entities should reassess their FTO position. A final damages award — potentially enhanced for willfulness — could set a significant benchmark royalty rate for sorbent-based mercury control across the U.S. coal power sector.
Sector-wide FTO reassessment neededFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Midwest Energy Emissions, Corp. | Company | Mercury emission control technology company — holder of US10343114 and US10596517Search in Eureka ↗ |
| Co-Plaintiff | MES, Inc. | Company | Search in Eureka ↗ |
| Defendant | Vistra Energy, Corp. | Company | Vistra Energy Corp. and ~43 co-defendants including CERT Operations entities and coal power affiliatesSearch in Eureka ↗ |
| Co-Defendant | CERT Holdings, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Arbor Fuels Company, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Cardinal Operating Company, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Holdings 2018, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | AEP Texas, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Operations RCB, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Dynegy Midwest Generation, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Dte Ref Holdings, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Dynegy Miami Fort, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | John Doe LLCs | Individual | Search in Eureka ↗ |
| Co-Defendant | CERT Operations III, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | NRG Texas Power, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Midwest Generation, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | H. A. Wagner, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Thomas Hill Refined Coal, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Portage Fuels Company, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Talen Energy Corporation | Company | Search in Eureka ↗ |
| Co-Defendant | AEP Generation Resources, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Operations II, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Gallagher Clean Energy, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Southwestern Electric Power Company | Company | Search in Eureka ↗ |
| Co-Defendant | Arthur J. Gallagher & Co. | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Operations V, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Joppa Refined Coal, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Wagner Coaltech, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | AIG Coal, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Coal Holdings, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Operations IV, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Illinois Power Resources Generating, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Dynegy, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | NRG Energy, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | Talen Energy Holdings, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | AIG Iowa Refined Coal, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | CERT Operations, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Iph, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Talen Generation, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Belle River Fuels Company, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Chem-Mod, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Louisa Refined Coal, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Walter Scott Refined Coal, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Brandon Shores, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Dte Ref Holdings II, LLC | Company | Search in Eureka ↗ |
| Co-Defendant | Midwest Generation EME, LLC | Company | Search in Eureka ↗ |
| Plaintiff counsel | Adrienne R. Dellinger | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Aisha M. Haley | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Daniel R. Pearson | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | James Michael Lennon | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Peter Akawie Mazur | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Richard A. Cochrane | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Warren J. McCarty , III | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff law firm | Devlin Law Firm LLC | Law Firm | Representing Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Defendant counsel | Christa Brown-Sanford | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Douglas M. Kubehl | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Frederick L. Cottrell , III | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Mark Johnson | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Megan LaDriere | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Nitika Gupta Fiorella | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Timothy S. Durst | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant counsel | Tyler E. Cragg | Attorney | Counsel for Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant law firm | Fish & Richardson PC | Law Firm | Representing Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant law firm | Potter, Anderson & Corroon LLP | Law Firm | Representing Vistra Energy, Corp.Search in Eureka ↗ |
| Defendant law firm | Richards, Layton & Finger, PA | Law Firm | Representing Vistra Energy, Corp.Search in Eureka ↗ |
| Presiding judge | Judge Christopher J. Burke | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The judgment is unusually detailed, distinguishing induced infringement (all CERT entities), contributory infringement (a defined subset), and willful infringement — each carrying distinct legal and damages consequences. The explicit finding that ‘all claims of US10343114 and US10596517 are not invalid’ is a broad validity affirmation, not limited to the asserted claims, which may strengthen the plaintiff’s position in any Federal Circuit appeal or future enforcement action. The costs and fees provisions preserve post-appeal remedies, consistent with a plaintiff anticipating an upward damages argument.
US10343114 & US10596517 — Mercury Oxidation and Removal Sorbent Technology
US10343114 (App. No. 15/978,760) and US10596517 (App. No. 15/997,091) protect compositions and methods for the oxidation and catalytic removal of mercury from flue gas streams generated by coal-fired power plants. These patents cover sorbent formulations — typically bromine-enhanced or halogenated activated carbon materials — that chemically interact with elemental mercury in the gas stream, enabling capture and removal before stack emission. The technology addresses compliance with U.S. EPA Mercury and Air Toxics Standards (MATS), making it commercially critical for coal-generation operators.
The strategic value of these patents lies in their position at the intersection of mandatory emissions compliance and coal-plant economics. Any operator subject to MATS who uses a sorbent-based mercury control system is a potential infringer if their materials or processes fall within the claims. The multi-entity defendant structure in this case — spanning refined coal suppliers, fuel processors, and power generators — demonstrates that the patent holder views the full supply chain as within reach. With invalidity rejected by the jury, the patents now present a heightened licensing risk for operators who have not taken a formal FTO position.
Should your team run an FTO against US10343114 and US10596517?
Any company involved in the formulation, supply, or application of mercury-control sorbents for coal-fired power plants should treat these patents as active enforcement risks following the March 2024 verdict. The jury’s validity affirmation and willfulness finding mean that a defendant who proceeds without an FTO analysis now faces not just infringement exposure, but the prospect of trebled damages. This is particularly acute for refined-coal operators, activated carbon suppliers, and emission-control technology integrators.
PatSnap Eureka’s FTO Search Agent can map your specific sorbent composition or process against the claim scope of US10343114 and US10596517 — and the three additional patents in this portfolio. Eureka’s claim-chart generation and prior art landscape tools allow R&D and legal teams to identify design-around opportunities, assess claim differentiation across the five-patent family, and monitor new continuation filings that could extend enforcement risk beyond the current patent terms.
Run a freedom-to-operate analysis on US10589225B2 to assess your product’s exposure
Run FTO in Eureka →Similar mercury sorbent and emissions-control patent cases in U.S. district courts
Explore related patent infringement cases involving mercury oxidation, sorbent technology, and coal-plant emission control in U.S. federal courts.
What this case signals for the mercury emission control IP landscape
A willful infringement verdict against a 43-defendant network reshapes enforcement risk across the U.S. coal and power generation sector.
Willfulness finding creates treble-damages leverage in future licensing
The jury’s willfulness finding gives Midwest Energy Emissions significant leverage in settlement negotiations with any remaining defendants or future infringers. Courts retain discretion to enhance damages up to three times under § 284, and the finding typically signals that the infringer had knowledge of the patent and proceeded regardless — making early licensing discussions commercially rational for similarly situated operators.
Contributory liability implicates sorbent suppliers, not just end users
The split verdict — induced infringement for all CERT entities, contributory infringement for a specific subset — suggests the court distinguished between those who supplied infringing sorbents and those who simply operated the technology. Suppliers and formulators of mercury-control sorbents should assess their exposure independently of the power-plant operators they serve, as contributory liability can attach upstream.
Midwest v Vistra — key questions answered
On March 1, 2024, a unanimous jury found the CERT-entity defendants liable for induced and willful infringement of claims 25–26 of US10343114 and claims 1–2 of US10596517. A subset was additionally found liable for contributory infringement. All invalidity challenges to those two patents were rejected. Judgment was entered for plaintiff Midwest Energy Emissions Corp.
Five patents were asserted: US10343114, US10596517, US10589225, US10668430, and US8168147 — all covering sorbent compositions and methods for the oxidation and removal of mercury from coal-fired power plant flue gas emissions. The jury verdict addressed claims in US10343114 and US10596517 specifically.
A willfulness finding under 35 U.S.C. § 284 gives the district court discretion to enhance damages by up to three times the jury award. The court has not yet issued a damages quantum or enhancement ruling. Additionally, the finding supports an exceptional-case motion for attorneys’ fees under § 285, which may be filed within 21 days of any appellate mandate.
Yes. The CERT defendants may appeal to the U.S. Court of Appeals for the Federal Circuit. To overturn a jury verdict, they must demonstrate that no reasonable jury could have reached the same conclusion — a demanding standard. The public record indicates costs and fees motions are held pending appeal, suggesting the parties anticipate further proceedings.
The case named 43+ defendants including Vistra Energy Corp., multiple CERT Operations entities (I–V, RCB), Dynegy affiliates, NRG Texas Power, AEP entities, Talen Energy, Arthur J. Gallagher & Co., and numerous refined coal LLC subsidiaries. The jury verdict was entered specifically against the CERT-entity defendants rather than all named defendants.
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