Patent No. EP2952177 (titled "Compositions Comprising Sphingosine I Phosphate (Sip) Receptor Modulators") was filed by Novartis on Oct 9, 2008. The application was issued on Jan 20, 2021.

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 |
|---|---|---|
| TEVA PHARMACEUTICALS | May 4, 2023 | D YOUNG |
| TEVA PHARMACEUTICALS | Sep 22, 2022 | D YOUNG |
| ACCORD HEALTHCARE | Oct 20, 2021 | HOFFMANN EITLE |
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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