Patent No. EP2272517 (titled "Ortho-Condensed Pyridine And Pyrimidine Derivatives ( E.G. Purines ) As Protein Kinases Inhibitors") was filed by Astex Therapeutics on Oct 25, 2005. The application was issued on Sep 20, 2017.

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 |
|---|---|---|
| STRAWMAN | Jun 26, 2015 | POTTER CLARKSON |
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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