Patent No. EP2439273 (titled "Human Monoclonal Antibodies To Programmed Death 1(Pd-1) And Methods For Treating Cancer Using Anti-Pd-1 Antibodies Alone Or In Combination With Other Immunotherapeutics") was filed by E R Squibb & Sons on May 2, 2006. The application was issued on Feb 27, 2019.

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 |
|---|---|---|
| DF MP DORRIES FRANK MOLNIA & POHLMAN PATENTANWALTE RECHTSANWALTE PARG MBB | Nov 27, 2019 | GREINER |
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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