Patent No. EP3256125 (titled "Dosing Regimen For A Selective S1P1 Receptor Agonist") was filed by Actelion Pharmaceuticals on Dec 10, 2015. The application was issued on Jan 26, 2022.

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 |
|---|---|---|
| STADA ARZNEIMITTEL | Oct 26, 2022 | HAMM & WITTKOPP |
| TEVA PHARMACEUTICALS | Oct 21, 2022 | 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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