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Patent No. EP3583947 (titled "Streptococcus Pneumoniae Capsular Polysaccharides And Conjugates Thereof") was filed by Pfizer on Jan 15, 2015. The application was issued on Oct 11, 2023.

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 |
|---|---|---|
| SANOFI PASTEUR | Jul 11, 2024 | ZWICKER |
| SK BIOSCIENCE | Jul 11, 2024 | ZWICKER |
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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