Patent No. EP4182281 (titled "Parallel-Flow Regenerative Shaft Kiln And Method For Calcining Carbonate Rock") was filed by Maerz Ofenbau on Jul 7, 2021. The application was issued on Jun 12, 2024.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| LHOIST RECHERCHE ET DEVELOPPEMENT | Mar 11, 2025 | CALYSTA |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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