Patent No. EP2477611 (titled "(Z)-2-Cyano-3-Hydroxy-But-2-Enoic Acid-(4'-Trifluormethylphenyl)-Amide Tablet Formulations With Improved Stability") was filed by Sanofi on Sep 14, 2010. The application was issued on Apr 5, 2017.

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 |
|---|---|---|
| PENTAFARMA SOCIEDADE TECNICO MEDICINAL | Jan 4, 2018 | LEDERER & KELLER PATENTANWALTE PARTNERSCHAFT MBB |
| WUESTHOFF & WUESTHOFF PATENTANWALTE PARTG MBB | Dec 29, 2017 | WIBBELMANN |
| COOKE | Dec 19, 2017 | ELKINGTON AND FIFE |
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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