Patent No. EP1851339 (titled "Methods And Compositions For Detecting A Drug Resistant Egfr Mutant") was filed by Memorial Sloan Kettering Cancer Center on Feb 13, 2006. The application was issued on May 18, 2016.

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 |
|---|---|---|
| KONIG SZYNKA TILMANN VON RENESSE | Feb 20, 2017 | ROTH |
| ROCHE | Feb 17, 2017 | BOSL |
| HOFFMANN EITLE | Feb 15, 2017 | 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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