Patent No. EP3305285 (titled "Anti-Androgens For The Treatment Of Non-Metastatic Castrate-Resistant Prostate Cancer") was filed by Aragon Pharmaceuticals on Sep 23, 2013. The application was issued on Sep 2, 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 |
|---|---|---|
| SANDOZ | Jun 2, 2021 | MAIWALD |
| SYNTHON | Jun 2, 2021 | HAMM & WITTKOPP |
| TEVA PHARMACEUTICALS | Jun 2, 2021 | 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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