Patent No. EP2397155 (titled "Methods And Compositions For The Treatment Of Persistent Infections And Cancer By Inhibiting The Programmed Cell Death 1 (Pd-1)Pathway") was filed by Dana Farber Cancer Institute on Jun 8, 2006. The application was issued on Dec 13, 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 |
|---|---|---|
| JANSSEN SCIENCES IRELAND UC | Sep 13, 2018 | CARPMAELS & RANSFORD |
| REGENERON PHARMACEUTICALS | Sep 12, 2018 | J A KEMP |
| SANOFI | Sep 11, 2018 | CARPMAELS & RANSFORD |
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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