Patent No. EP2223688 (titled "(+)-2-[1-(3-Ethoxy-4-Methoxyphenyl)-2-Methylsulfonylethyl]-4-Acetylaminoisoindoline-1,3-Dione: Methods Of Using And Compositions Thereof") was filed by Amgen Europe on Mar 20, 2003. The application was issued on May 29, 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 |
|---|---|---|
| GALENICUM HEALTH SLU | Mar 2, 2020 | - |
| HEXAL | Feb 28, 2020 | TER MEER STEINMEISTER & PARTNER |
| HOFFMANN EITLE | Feb 28, 2020 | - |
| ZENTIVA KS | Feb 28, 2020 | HOFFMANN EITLE |
| WUESTHOFF & WUESTHOFF PATENTANWALTE PARTG MBB | Feb 26, 2020 | SONNENHAUSER |
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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