Patent No. EP2278960 (titled "Dosing Regimen For A Selective Sip1 Receptor Agonist") was filed by Actelion Pharmaceuticals on Mar 12, 2009. The application was issued on Nov 13, 2019.

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 |
|---|---|---|
| HOLLATZ | Aug 29, 2017 | TER MEER UND PARTNER |
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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