Bromerc Ltd v. Arthur J Gallagher & Co

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Bromerc Ltd. (Hong Kong) and Mercex Ltd. (United Kingdom)
  • Defendant: Arthur J. Gallagher & Co. (Delaware); Chem-Mod LLC (Delaware); and 21 other associated "Refined Coal LLC" entities (Delaware)
  • Plaintiff's Counsel: Farnan LLP; Desmarais LLP
• Case Identification: 1:26-cv-00217, D. Del., 03/02/2026
• Venue Allegations: Venue is asserted in the District of Delaware on the basis that all named defendants are entities organized under the laws of Delaware.
• Core Dispute: Plaintiffs allege that Defendants' "Chem-Mod Solution," a process for reducing mercury emissions from coal-fired power plants, infringes a patent related to removing mercury from industrial flue gases.
• Technical Context: The technology addresses the removal of toxic mercury from the flue gas of high-temperature combustion facilities, a significant environmental and public health concern regulated by federal standards.
• Key Procedural History: The patent-in-suit is a reissue of U.S. Patent No. 6,878,358. The complaint alleges that the original '358 patent was foundational to the industry and was cited as key prior art by Defendants' retained expert in separate, prior litigation involving the same accused process (the Midwest Energy Emissions case). Plaintiffs allege sending notice letters to key Defendants on the day the reissue patent was granted.

Case Timeline

II. Technology and Patent(s)-in-Suit Analysis

U.S. Reissued Patent No. RE47,980 E - "Process for Removing Mercury from Flue Gases"

• Patent Identification: U.S. Reissued Patent No. RE47,980 E, issued May 12, 2020.

The Invention Explained

• Problem Addressed: Prior to the invention, methods for removing mercury from the flue gas of power plants and incinerators were described as "not sufficiently effective" and "relatively expensive" due to high capital and operating costs RE'980 Patent, col. 1:58-61 The complaint asserts that conventional wisdom taught away from using bromine at high temperatures or in the presence of sulfur, conditions common in coal combustion Compl. ¶59
• The Patented Solution: The invention is a process that introduces bromine or a bromine compound into the flue gas of a high-temperature plant, such as a coal-fired power station RE'980 Patent, abstract The process is performed at high temperatures (at least 800°C) and in the presence of a sulfur compound, which causes a gas-phase reaction that converts difficult-to-remove elemental mercury into an oxidized, water-soluble form that can be more easily captured by downstream cleanup equipment like scrubbers or sorbents RE'980 Patent, col. 2:31-45 RE'980 Patent, col. 14:58-15:17
• Technical Importance: The process claims to enable "substantial, essentially complete, oxidation of the mercury," allowing for its "substantial removal" in an efficient and inexpensive manner without extensive retrofitting of existing plants RE'980 Patent, col. 2:5-9 RE'980 Patent, col. 2:42-45

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 19 and dependent claim 20 Compl. ¶¶132-133
• Independent Claim 19 includes the following essential elements:
  • A process for removing mercury from the flue gas of a furnace burning sulfur-containing coal.
  • Feeding bromine (or a bromine compound) to the mercury-containing flue gas.
  • The first contact between the bromine and flue gas occurs at a temperature of at least 800°C.
  • The combustion occurs in the presence of a sulfur compound, causing a gas-phase reaction between bromine and mercury.
  • This reaction produces a flue gas where the mercury is "essentially completely oxidized."
  • The bromine can be fed directly to the furnace or to the flue gas downstream of the furnace.
  • Subjecting the resulting flue gas to a cleanup stage (wet scrubbing and/or a dry stage with a sorbent) to substantially remove the oxidized mercury.
• The complaint does not explicitly reserve the right to assert other claims but focuses its allegations on claims 19 and 20 Compl. ¶¶132-133

III. The Accused Instrumentality

Product Identification

• The accused instrumentality is the "Chem-Mod Solution," a process for removing mercury from the flue gases of coal-fired power plants Compl. ¶90

Functionality and Market Context

• The Chem-Mod process involves mixing coal with two reagents before combustion: "MerSorb," a bromine compound (specifically, a 52% calcium bromide solution in water), and "S-Sorb," a dry powder sorbent (Compl. ¶92; Compl. ¶93).
• This mixture, referred to by Defendants as "refined coal," is then combusted in a coal-fired power plant furnace at temperatures alleged to exceed 800°C Compl. ¶¶92-94 During combustion, the bromine from MerSorb is alleged to react with elemental mercury released from the coal, converting it to an oxidized form Compl. ¶96 This oxidized mercury is then captured by the S-Sorb sorbent or other pollution control equipment Compl. ¶97
• The complaint alleges this process was marketed as a low-cost method to reduce mercury emissions, enabling power plants to qualify for billions of dollars in federal tax credits under Section 45 of the tax code (Compl. ¶¶4; Compl. ¶45; Compl. ¶99). A diagram in the complaint illustrates the business model, showing Defendant Gallagher licensing the Chem-Mod Solution to various entities who then implement it at associated coal plants Compl. p. 30

IV. Analysis of Infringement Allegations

• Claim Chart Summary: The complaint provides a narrative infringement theory for claim 19, which is summarized below Compl. ¶132

RE'980 Patent Infringement Allegations

• Identified Points of Contention:
  • Scope Questions: The primary dispute may center on the "feeding" step. Claim 19 recites "feeds bromine to the furnace or to the flue gas." The complaint alleges infringement by pre-mixing a bromine compound with coal before it is fed to the furnace Compl. ¶93 A key question for the court will be whether this pre-mixing step constitutes "feeding bromine to the furnace" as contemplated by claim 19. The patent's disclosure of adding the compound to coal upstream of the furnace, and the specific language of dependent claim 20 ("mixing the bromine with the coal to be combusted in the furnace, or upstream of the furnace"), may inform this analysis RE'980 Patent, col. 4:25-28 RE'980 Patent, col. 15:18-20
  • Technical Questions: A factual question will be whether the Chem-Mod process results in mercury that is "essentially completely oxidized" in the gas phase, as required by the claim. The complaint alleges the process achieves high rates of mercury removal (up to 98%) but provides less direct evidence on the specific degree of oxidation Compl. ¶98 The defense may argue that the observed removal is due to other mechanisms or that the degree of gas-phase oxidation does not meet the "essentially completely" threshold.

V. Key Claim Terms for Construction

• The Term: "essentially completely oxidized"

• Context and Importance: This term in claim 19 defines the required outcome of the gas-phase reaction and is critical for infringement. Its interpretation will set the technical benchmark the accused process must meet. Practitioners may focus on this term because its qualitative nature ("essentially completely") creates ambiguity that is central to the dispute.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification uses similar, non-quantitative language, describing the process as achieving "substantial, essentially complete, oxidation" RE'980 Patent, col. 2:42-43 This could support an argument that the term does not require 100% oxidation but rather a high degree of conversion sufficient for effective removal.
  • Evidence for a Narrower Interpretation: Defendants may argue that the term implies a level of oxidation far exceeding that of prior art methods and that Plaintiffs must prove a specific, very high percentage of conversion. The patent contrasts its results with chlorine, which was less effective, suggesting "essentially completely" implies a transformative improvement RE'980 Patent, col. 4:61-67

• The Term: "feeds bromine to the furnace"

• Context and Importance: The infringement allegation hinges on this phrase covering the pre-mixing of a bromine solution with coal. The definition of this term will determine whether the accused process, as described, meets this limitation of independent claim 19.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification discloses adding the bromine compound "to the waste mixture, coal or the like to be burnt, upstream of the furnace" RE'980 Patent, col. 4:22-24 Further, dependent claim 20 explicitly recites "mixing the bromine with the coal to be combusted in the furnace, or upstream of the furnace" RE'980 Patent, col. 15:18-20 Plaintiffs may argue this demonstrates that the inventors considered pre-mixing to be within the scope of the invention described in claim 19.
  • Evidence for a Narrower Interpretation: A defendant could argue that the plain meaning of "feeds... to the furnace" requires introducing the bromine as a separate stream into the combustion chamber, distinct from the fuel feed. They might argue that dependent claim 20 adds a limitation not present in independent claim 19, and to read that limitation back into the independent claim would violate the doctrine of claim differentiation.

VI. Other Allegations

• Indirect Infringement: The complaint alleges that Defendants Arthur J. Gallagher & Co. and Chem-Mod LLC induced infringement by licensing the Chem-Mod Solution and supplying the necessary reagents (MerSorb and S-Sorb) with the knowledge and intent that third parties would use them to practice the patented method Compl. ¶149 The complaint also alleges contributory infringement, stating the supplied reagents are a material part of the invention, are specially adapted for infringement, and are not staple articles of commerce Compl. ¶151
• Willful Infringement: The complaint alleges willfulness based on both pre- and post-suit knowledge. It asserts Defendants had knowledge of the original patent as early as 2010 through their own patent filings Compl. ¶113, through their involvement in prior litigation where the patent was foundational prior art Compl. ¶¶114-116, and through direct notice letters sent by Plaintiffs' counsel on the day the RE'980 Patent reissued, May 12, 2020 Compl. ¶123 Continued infringement after this date is alleged to be willful Compl. ¶153

VII. Analyst's Conclusion: Key Questions for the Case

• A core issue will be one of definitional scope: can the phrase "feeds bromine to the furnace" in independent claim 19 be construed to cover the accused process of pre-mixing a bromine additive with coal before combustion? The relationship between independent claim 19 and the more explicit language in dependent claim 20 will be a central point of legal argument.
• A second central issue will be one of evidentiary proof: what technical evidence will be required to demonstrate that the accused Chem-Mod process achieves mercury that is "essentially completely oxidized" in the gas phase? The outcome may depend on expert testimony and empirical data concerning the chemical reactions inside a commercial coal furnace.
• Finally, a key question for damages will be willfulness: given the complaint's detailed allegations of Defendants' long-standing awareness of the underlying invention through prior patents and litigation, and specific notice on the day of reissue, the court will have to determine whether any infringement after May 12, 2020 was deliberate, potentially justifying enhanced damages.