Patent No. EP2337849 (titled "Factor Ix Polypeptide Mutant, Its Uses And A Method For Its Production") was filed by Simioni on Sep 15, 2009. The application was issued on Jun 13, 2018.

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 |
|---|---|---|
| GREAVES BREWSTER | Mar 13, 2019 | GREAVES BREWSTER |
| BAXALTA | Mar 12, 2019 | HOFFMANN EITLE |
| PFIZER | Mar 12, 2019 | PFIZER |
| WEINZIERL | Mar 12, 2019 | SCHIWECK WEINZIERL KOCH PATENTANWALTE PARTNERSCHAFT MBB |
| STRAWMAN | Dec 17, 2018 | D YOUNG |
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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