Company's Mercury Removal Technology Patents Protected Against Invalidity Claims Following Termination of All Inter Partes Review (IPR) Petitions; Collection Efforts Remain Underway Following $78 Million Judgment

CORSICANA, Texas, June 03, 2026 (GLOBE NEWSWIRE) -- Birchtech Corp. (NYSE:BCHT) (TSX:BCHT) ("Birchtech" or the "Company"), a leader in specialty activated carbon technologies for sustainable air and water treatment, today announced the filing of termination requests for all remaining Inter Partes Review (IPR) petitions filed against the Company's core patents. The final remaining entities involved in IPR proceedings have resolved their disputes with the Company and have moved to bring a complete end to all previously filed third-party challenges to the validity of the Company's patented SEA® mercury emissions removal technology.

No other active IPR proceedings remain. Every petition filed with the Patent Trial and Appeal Board (PTAB) to challenge Birchtech's patents has been dismissed, removed prior to institution, or resolved.

The Final Result Following Seven Years of Patent Enforcement

Birchtech's patented SEA® sorbent technology captures mercury emissions from coal-fired power plants, which is required under federal environmental regulations. Since filing its first patent infringement claim in 2019, the Company has pursued a disciplined strategy to protect its intellectual property portfolio, resulting in approximately $37.0 million in license fees and settlements received from utilities since 2020.

In March 2024, the Company received a favorable verdict following a jury trial in the U.S. District Court for the District of Delaware, whereby a federal jury returned a unanimous verdict against the CERT defendants on all counts, including findings of willful, inducing and contributory infringement. In December 2025, the Court increased the final judgement amount to $78.4 million awarded to Birchtech, inclusive of pre-judgment interest, with post-judgment interest continuing to accrue daily.

In 2024 and 2025, Birchtech filed additional litigation in multiple jurisdictions against utility defendants whose cases were subsequently consolidated in the U.S. District Court for the Southern District of Iowa. Those defendants separately filed IPR petitions at PTAB in an attempt to invalidate the Company's underlying patents.