Patent No. EP1819326 (titled "Dosage Regimen Of An S1P Receptor Agonist") was filed by Novartis on Nov 28, 2005. The application was issued on Jul 2, 2014.

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 |
|---|---|---|
| GENERICS UK TRADING MYLAN | Apr 1, 2015 | GALLAFENT |
| SANOVEL IIAC SAN VE TIC | Mar 31, 2015 | BECKMANN |
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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