Union Electric Company v. Birchtech Corporation

This Inter Partes Review (IPR) case at the Patent Trial and Appeal Board (PTAB) involves petitioner Union Electric Company and patent owner Birchtech Corporation, concerning U.S. Patent 10,668,430. Union Electric Company, operating as Ameren Missouri, is a major public utility providing electric, natural gas, and other energy services across Missouri and parts of Illinois and Iowa. Birchtech Corporation is an environmental technology firm that develops and commercializes specialty activated carbon technologies for air and water purification, prominently featuring its proprietary Sorbent Enhancement Additive (SEA®) technologies for mercury emissions capture in the coal-fired utility sector. The IPR petition was filed in the context of broader patent disputes, as Birchtech has a history of litigating against utility companies, including Union Electric Co., for alleged unlicensed use of its mercury emissions reduction technologies.

The patent at issue, U.S. Patent 10,668,430, is titled "Mercury emission control technologies for reducing mercury emissions from combustion flue gas and related methods" and generally describes methods and systems for removing mercury from flue gas, particularly from coal-fired power plants, using sorbent enhancement additives. The procedural posture for this case is an Inter Partes Review before the PTAB, which is a specialized administrative tribunal within the U.S. Patent and Trademark Office. This venue is significant because IPRs offer an alternative, often faster and less expensive, mechanism to challenge the validity of patent claims based on prior art (patents and printed publications) compared to district court litigation. The status of this specific IPR is "Not Instituted - Procedural," meaning the PTAB declined to initiate the review on procedural grounds rather than reaching a decision on the merits of patentability.

This case is notable due to its connection to ongoing patent enforcement by Birchtech against the utility industry concerning environmental control technologies. Birchtech actively licenses its mercury capture technologies and has pursued litigation to protect its intellectual property, including a $57 million jury verdict for willful infringement against other operating companies in 2024, which was later increased to approximately $78 million in December 2025. Union Electric Company was a named defendant in one of these patent infringement lawsuits filed by Birchtech (then Midwest Energy Emissions Corp.) in July 2024. The "Not Instituted - Procedural" outcome in this IPR reflects the PTAB's discretionary authority to deny institution for various reasons, including issues with the petition itself or considerations of co-pending district court litigation, thereby preventing a merits review of the patentability challenge in this instance.

Union Electric Company (Petitioner) filed an Inter Partes Review (IPR) petition, IPR2025-01322, against Birchtech Corporation's (Patent Owner) U.S. Patent 10668430 at the Patent Trial and Appeal Board (PTAB). The petition was ultimately not instituted on procedural grounds. This IPR proceeding occurred in the context of broader patent litigation initiated by Birchtech Corporation against several utility companies, including Union Electric.

Here's a chronological overview of the key legal developments:

• July 30, 2024 – Patent Infringement Lawsuits Filed: Midwest Energy Emissions Corp. (operating as ME2C Environmental, and closely associated with Birchtech Corp.) announced the filing of patent infringement lawsuits against 14 defendants, including Union Electric Company. These suits were filed in U.S. District Courts in Arizona, Iowa, and Missouri, alleging infringement of ME2C Environmental's mercury emissions reduction technologies (SEA® Sorbent Enhancement Additive Technologies). The lawsuits sought damages, legal expenses, and injunctive relief, claiming willful infringement.
• July 18, 2025 – IPR Petition Filed: Union Electric Company filed its IPR petition, IPR2025-01322, challenging U.S. Patent 10668430, owned by Birchtech Corporation. This was likely a defensive move in response to the ongoing patent infringement litigation.
• November 20, 2025 – IPR Not Instituted - Procedural: The PTAB issued a decision denying institution of IPR2025-01322 on procedural grounds. Several other IPRs filed by Union Electric Company against Birchtech Corporation on different patents were also denied institution on the same date and on procedural grounds. While the specific reasoning for IPR2025-01322's denial is not detailed in the provided snippets, the PTAB, under its Director Review process, frequently considered discretionary factors for denial, particularly concerning parallel district court litigation and the "Fintiv" framework, which weighs factors such as the stage of the parallel litigation and the investment made by the parties in the district court. Additionally, the USPTO Director began issuing "summary notices" denying institution for IPRs starting October 20, 2025.
• December 18, 2025 – Significant District Court Judgment for Birchtech: Birchtech Corp. announced that a U.S. District Court of Delaware judge issued a final memorandum opinion, leading to a proposed final judgment increasing its judgment amount to approximately $78 million. This followed a $57 million jury verdict in March 2024 against operating companies of refined coal (the remaining "CERT" Defendants) in a patent infringement case initiated in 2019. This illustrates the significant investment and progress in Birchtech's patent enforcement efforts in district courts around the time the IPRs were being decided.
• January 12, 2026 – Precedential Decision on Parallel Petitions: The USPTO designated PacifiCorp v. Birchtech Corp., IPR2025-00687, as a precedential decision. In this decision, the Director vacated and remanded institution decisions for parallel petitions challenging the same patents, clarifying that parallel petitions should be rare, and in cases with priority date disputes, the Board should either resolve the dispute at institution or institute, at most, the first-ranked petition. This precedential decision, involving Birchtech, further highlights the PTAB's focus on managing duplicative efforts and could have influenced the procedural non-institution of IPR2025-01322, particularly if it was considered a "parallel petition" or if there were similar issues.

The outcome for IPR2025-01322 is that the petition was not instituted, meaning a full IPR trial on the merits of US Patent 10668430 did not proceed at the PTAB. This non-institution likely preserved Birchtech Corporation's ability to assert US Patent 10668430 in the ongoing district court infringement litigation against Union Electric Company.

Based on publicly available web search results, the counsel of record representing Union Electric Company (the Petitioner) in IPR2025-01322 against Birchtech Corporation could not be definitively identified.

Information regarding specific legal representation for Inter Partes Review (IPR) proceedings before the Patent Trial and Appeal Board (PTAB) is typically detailed in the official docket filings, which are accessible through the PTAB's Patent Trial and Appeal Case Tracking System (P-TACTS) or commercial legal databases. Many search results for IPRs, including related cases involving Union Electric Company and Birchtech Corporation (e.g., IPR2025-01324), indicate that "Counsel Representation" details are "Subscription Required" to view.

General searches for Union Electric Company's legal representation show their involvement in various types of litigation, particularly utility and environmental cases, with different law firms. However, these searches do not specifically link attorneys or firms to their patent-related IPR filings. Given that IPR2025-01322 was "Not Instituted - Procedural," detailed public records, such as legal news articles or firm announcements highlighting representation in instituted cases, may be less prevalent.

Birchtech Corporation is represented by the following counsel in IPR2025-01322:

• Name: Hamad M. Hamad
• Role: Counsel of record
• Firm: Caldwell, Cassady & Curry PC
• Office Location: The firm Caldwell Cassady & Curry PC has an office in Dallas, Texas.
• Relevant Experience: Hamad M. Hamad is a principal at Caldwell Cassady & Curry PC, a firm known for its intellectual property litigation. He has represented patent owners in various inter partes review proceedings before the PTAB.