Patent No. EP2397156 (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 Nov 2, 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 |
|---|---|---|
| JANSSEN BIOTECH | Aug 2, 2017 | CARPMAELS & RANSFORD |
| PFIZER | Aug 2, 2017 | PFIZER |
| REGENERON PHARMACEUTICALS | Aug 2, 2017 | J A KEMP |
| SANOFI | Aug 2, 2017 | CARPMAELS & RANSFORD |
| ARES TRADING | Jul 27, 2017 | MERCK SERONO |
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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