Patent No. EP2797581 (titled "Formulations Of (+)-2-[1-(3-Ethoxy-4-Methoxy-Phenyl)-2-Methanesulfonyl-Ethyl]-4-Acetyl Aminoisoindoline-1,3-Dione") was filed by Amgen Europe on Dec 26, 2012. The application was issued on May 6, 2020.

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 |
|---|---|---|
| GALENICUM HEALTH SLU | Feb 8, 2021 | GALENICUM HEALTH SLU |
| KRKA | Feb 5, 2021 | HOEFER & PARTNER PATENTANWALTE MBB |
| GENERICS UK | Jan 19, 2021 | 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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