Patent No. EP2691112 (titled "Stable Formulations Of Antibodies To Human Programmed Death Receptor Pd-1 And Related Treatments") was filed by Merck Sharp & Dohme on Mar 29, 2012. The application was issued on May 23, 2018.

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 |
|---|---|---|
| KNIG SZYNKA TILMANN VON RENESSE | Feb 25, 2019 | KNIG SZYNKA TILMANN VON RENESSE |
| KONIG SZYNKA TILMANN VON RENESSE | Feb 25, 2019 | HOFFMANN EITLE |
| KONIG SZYNKA TILMANN VON RENESSE | Feb 25, 2019 | KONIG SZYNKA TILMANN VON RENESSE DUSSELDORF |
| KONIG SZYNKA TILMANN VON RENESSE | Feb 25, 2019 | KONIG SZYNKA TILMANN VON RENESSE PATENTANWALTE PARTNERSCHAFT MBB DUSSELDORF |
| STRAWMAN | Feb 22, 2019 | D YOUNG |
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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