Patent No. EP2101731 (titled "Endoxifen Methods And Compositions") was filed by Jina Pharmaceuticals on Nov 21, 2007. The application was issued on Jan 31, 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 |
|---|---|---|
| BAYER | Oct 31, 2018 | MAIWALD |
| BESINS HEALTHCARE MONACO SAM | Oct 29, 2018 | NEDERLANDSCH OCTROOIBUREAU |
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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