Patent No. EP2266573 (titled "Fulvestrant Formulation") was filed by Astrazeneca on Jan 8, 2001. The application was issued on Jun 17, 2015.

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 |
|---|---|---|
| INTAS PHARMACEUTICALS | Mar 17, 2016 | TER MEER UND PARTNER |
| TEVA PHARMACEUTICAL INDUSTRIES LTD | Mar 16, 2016 | BEST |
| FRESENIUS KABI DEUTSCHLAND | Mar 8, 2016 | FRESENIUS KABI DEUTSCHLAND |
| ACTAVIS GROUP PTC EHF | Feb 16, 2016 | BEST |
| HEXAL | Oct 29, 2015 | GREINER |
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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