Patent No. EP2544680 (titled "Use Of Erbb3 Inhibitors In The Treatment Of Triple Negative And Basal-Like Breast Cancers") was filed by Merrimack Pharmaceuticals on Mar 11, 2011. The application was issued on Jan 14, 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 |
|---|---|---|
| DAIICHI SANKYO | Oct 13, 2015 | HOFFMANN EITLE |
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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