EPO upholds Solvay soda ash recycling patent in WE Soda dispute

  • European Patent Office upheld Solvay’s EP 3 971 138 B1 soda ash recycling patent, subject to limited amendments; WE Soda filed the opposition on Feb. 13, 2025.
  • The May 19, 2026 decision keeps the unitary patent in force, enabling a single Unitary Patent Court action covering at least 18 countries.
  • Separately, a Dutch court ruling on Dec. 3, 2025 upheld Solvay’s EP 2 878 579 B1 in an infringement case tied to WE Soda’s Kazan Soda facility.
  • The Dutch judgment included a Netherlands injunction ordering defendants to halt imports and supply upon service; WE Soda has appealed, case pending.


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