Midwest Energy Emissions v. Evergy Kansas Central: Six Mercury Sorbent Patents Transferred to MDL
Midwest Energy Emissions Corp. filed a patent infringement action in the Iowa Southern District Court against Evergy Kansas Central, Inc., asserting six patents covering sorbents for the oxidation and removal of mercury from flue gas. After 149 days, the case was transferred and consolidated into MDL No. 24-3132 — joining what is now a multi-district proceeding centralising related mercury emissions patent disputes.
Six mercury sorbent patents draw MDL consolidation in Iowa infringement action
Midwest Energy Emissions Corp. filed this infringement action on April 28, 2025, in the Iowa Southern District Court against Evergy Kansas Central, Inc., asserting six US patents — US10589225B2, US10596517B2, US10926218B2, US10343114B2, US10668430B2, and US10933370B2 — all directed at sorbent compositions and methods for the oxidation and removal of mercury from power plant flue gas streams. The defendant, Evergy Kansas Central, is a utility operating coal-fired and transitioning generation assets in the Kansas region where mercury emissions control is a regulated obligation.
The case did not proceed to a merits ruling. Per a Transfer Order filed April 24, 2025, the Iowa Southern District Court transferred and consolidated this matter into MDL No. 24-3132, a multi-district litigation proceeding centralising related mercury emissions patent cases. Future filings in this matter will be submitted under MDL No. 24-3132. The transfer effectively pauses independent progress of this action, folding it into coordinated pre-trial proceedings alongside other defendants and related cases.
The 149-day duration reflects the rapid administrative processing typical of MDL consolidation rather than any substantive litigation advance. The transfer suggests Midwest Energy Emissions is pursuing a broader enforcement campaign against multiple utilities, consistent with a portfolio licensing or enforcement strategy targeting the power generation sector’s mercury control compliance obligations. What remains unknown from the public record is whether settlement discussions are underway in the MDL, which defendants are co-consolidated, and what claim construction positions each party intends to advance.
Filing to Case Transferred in 149 days
149 days from filing to transfer — typical for MDL consolidation orders issued early in proceedings
Case transferred to MDL No. 24-3132: what the consolidation means for both parties
MDL transfer consolidates related patent actions for pre-trial coordination
A transfer to Multi-District Litigation (MDL) under 28 U.S.C. § 1407 consolidates cases sharing common questions of fact before a single transferee court for coordinated pre-trial proceedings. No merits ruling was issued here. The Iowa Southern District Court transferred this case to MDL No. 24-3132 pursuant to a Transfer Order dated April 24, 2025. This means discovery, claim construction (Markman hearings), and any dispositive motions will be managed centrally, potentially across multiple defendants.
Procedural transfer — no merits rulingMDL consolidation can amplify enforcement reach for the patent holder
For Midwest Energy Emissions, MDL consolidation suggests a coordinated multi-defendant campaign. Centralised proceedings allow the patent holder to achieve consistent claim constructions across defendants, potentially strengthening enforcement leverage. If Markman rulings favour the plaintiff in the MDL, they apply across all consolidated cases. The risk is that a single adverse claim construction ruling could undermine the entire enforcement campaign simultaneously.
Centralised enforcement opportunityEvergy Kansas Central now litigates in a shared MDL forum with other utilities
Consolidation into MDL No. 24-3132 means Evergy Kansas Central will share pre-trial proceedings with co-defendants, potentially reducing individual litigation costs through shared discovery and coordinated invalidity arguments. However, individual damages and liability issues are typically remanded to originating courts after MDL pre-trial coordination concludes. Evergy retains the ability to present utility-specific defences at the damages stage.
Shared pre-trial; individual damages exposure remainsPower sector mercury compliance IP now centralised — watch MDL claim construction
With multiple utilities likely consolidated in MDL No. 24-3132, Markman rulings from the transferee court will set the interpretive standard for all six asserted patents. Power generators using activated carbon or brominated sorbent systems for mercury control should monitor claim construction outcomes closely. An adverse ruling for defendants in the MDL could expose the broader utility sector to infringement risk and accelerate licensing demand across coal and gas fleet operators.
Sector-wide claim construction riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Midwest Energy Emissions, Corp. | Company | Mercury emissions control technology company — holder of US10589225B2 and five related mercury sorbent patentsSearch in Eureka ↗ |
| Defendant | Evergy Kansas Central, Inc. | Company | Evergy Kansas Central, Inc. — regulated electric utility operating generation assets in KansasSearch in Eureka ↗ |
| Plaintiff counsel | Austin Curry | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Bradley Wayne Caldwell | Attorney | Counsel for Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Justin Thomas Nemunaitis | 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 law firm | Caldwell Cassady Curry PC | Law Firm | Representing Midwest Energy Emissions, Corp.Search in Eureka ↗ |
| Defendant counsel | Christopher J. Jessen | Attorney | Counsel for Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Defendant counsel | Kelsey J. Knowles | Attorney | Counsel for Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Defendant counsel | Megan LaDriere White | Attorney | Counsel for Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Defendant counsel | Michael R. Reck | Attorney | Counsel for Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Defendant counsel | Paul R. Morico | Attorney | Counsel for Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Defendant law firm | Baker Botts, LLP | Law Firm | Representing Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Defendant law firm | Belin Mccormick, PC | Law Firm | Representing Evergy Kansas Central, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Iowa Southern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The transfer order language confirms this case was procedurally consolidated into MDL No. 24-3132 without any substantive ruling on infringement, validity, or damages. The reference to the case being ‘formerly District of Kansas’ suggests prior proceedings or related matters were already in progress before the Iowa filing. No claim construction, summary judgment, or liability determination was reached. All future proceedings — including Markman hearings and any merits adjudication — will occur within the MDL framework, with individual damages issues potentially remanded to originating courts thereafter.
US10589225B2 — Sorbents for mercury oxidation and removal from flue gas
The six asserted patents — US10589225B2, US10596517B2, US10926218B2, US10343114B2, US10668430B2, and US10933370B2 — share a technical domain covering sorbent-based systems for the oxidation and removal of mercury from combustion flue gas, a core compliance technology for coal-fired power generation under EPA MATS regulations. The application numbers span filings from approximately 2015 through 2019, suggesting a sustained prosecution strategy building layered claim coverage across compositions, methods, and process variants within the mercury emissions control space.
For utilities and sorbent suppliers, this six-patent portfolio represents significant IP risk in a mandated compliance technology category. Midwest Energy Emissions has demonstrated willingness to assert multiple patents simultaneously against individual defendants, and MDL consolidation suggests similar claims are being pressed against additional utilities. Competitors and licensees in the activated carbon injection, brominated sorbent, and mercury oxidation catalyst markets should conduct thorough FTO analysis against the full patent family before commercialising or expanding mercury control product lines.
Should you run an FTO against US10589225B2 and the Midwest Energy Emissions portfolio?
Any company supplying, deploying, or operating sorbent-based mercury removal systems for coal-fired or gas-fired power generation should treat this six-patent portfolio as a priority FTO target. The patents cover sorbent compositions and mercury oxidation methods that are directly implicated by activated carbon injection systems, brominated sorbent products, and related mercury control equipment sold or used in US utility markets. Given EPA MATS compliance obligations, utilities cannot easily design around these technologies without regulatory risk.
PatSnap Eureka’s FTO Search Agent can map all six asserted patents and their full prosecution histories, identify claim scope across the portfolio, and flag related continuation or divisional applications that may not yet be asserted. Eureka’s citation and family analysis tools allow R&D and procurement teams to assess whether specific sorbent formulations or mercury control process steps fall within the asserted claims — enabling informed licensing, design-around, or invalidity strategy decisions ahead of potential MDL exposure.
Run a freedom-to-operate analysis on US10589225B2 to assess your product’s exposure
Run FTO in Eureka →Similar mercury sorbent patent infringement cases in US district courts
Explore related patent infringement actions involving mercury emissions control technology asserted against US utilities in federal district courts and MDL proceedings.
What this case signals for the mercury emissions control IP landscape
MDL consolidation of mercury sorbent patent claims suggests a structured, multi-target enforcement campaign that could reshape compliance technology licensing across the US power sector.
Mercury control compliance creates durable patent enforcement targets
US EPA mercury and air toxics standards (MATS) require coal-fired utilities to deploy sorbent-based mercury removal systems — making ongoing use of patented sorbent technology a regulatory necessity, not a discretionary choice. This structural demand gives patent holders like Midwest Energy Emissions persistent leverage against operating utilities who cannot simply design around the technology without regulatory consequence.
MDL claim construction will be the pivotal moment for all consolidated defendants
In MDL proceedings, the Markman hearing before the transferee court produces claim constructions binding on all co-consolidated cases. Utilities and their counsel should co-ordinate invalidity and non-infringement positions early. A defendant-favourable claim construction in the MDL could collapse the entire enforcement campaign; an adverse one could force settlements across multiple cases simultaneously.
Midwest v Evergy — key questions answered
The case was transferred and consolidated into MDL No. 24-3132 after 149 days. Midwest Energy Emissions Corp. filed the infringement action on April 28, 2025, in the Iowa Southern District Court, asserting six mercury sorbent patents against Evergy Kansas Central, Inc. No merits ruling was issued before the April 24, 2025 Transfer Order consolidated the matter into the multi-district litigation proceeding.
Midwest Energy Emissions asserted six US patents: US10589225B2, US10596517B2, US10926218B2, US10343114B2, US10668430B2, and US10933370B2. All patents relate to sorbent compositions and methods for the oxidation and removal of mercury from power plant flue gas streams, a technology category regulated under EPA Mercury and Air Toxics Standards (MATS).
Transfer to MDL No. 24-3132 means this case is now consolidated with related mercury sorbent patent actions before a single transferee court for coordinated pre-trial proceedings, including discovery and claim construction. Individual merits issues — such as damages specific to Evergy Kansas Central — are typically remanded to the originating court after MDL pre-trial coordination concludes. No substantive merits ruling was made in the Iowa proceedings.
The case concerns sorbents for the oxidation and removal of mercury — specifically the sorbent-based mercury control systems used in coal-fired power generation to comply with EPA MATS regulations. The patents cover compositions and methods for mercury oxidation and capture from flue gas, implicating activated carbon injection systems and related mercury control technologies deployed by utilities.
Midwest Energy Emissions was represented by Austin Curry, Bradley Wayne Caldwell, Justin Thomas Nemunaitis, and Richard A. Cochrane of Caldwell Cassady Curry PC. Evergy Kansas Central was represented by Christopher J. Jessen, Kelsey J. Knowles, Megan LaDriere White, Michael R. Reck, and Paul R. Morico of Baker Botts, LLP and Belin McCormick, PC.
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