Patent No. EP3481774 (titled "Method For Manufacturing Briquettes Containing A Calcium-Magnesium Compound And An Iron-Based Compound, And Briquettes Obtained Thereby") was filed by Lhoist Recherche ET Dveloppement on Jul 7, 2017. The application was issued on Sep 30, 2020.

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 |
|---|---|---|
| FELS VERTRIEBS UND SERVICE | Jun 29, 2021 | MAIKOWSKI & NINNEMANN PATENTANWALTE PARTNERSCHAFT MBB |
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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