Patent No. EP3225233 (titled "Sodium Chloride Solution For Drug Reconstitution Or Dilution") was filed by Wyeth on Oct 27, 2006. The application was issued on Aug 14, 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 |
|---|---|---|
| BIOVERATIV THERAPEUTICS | May 14, 2020 | ZWICKER |
| SWEDISH ORPHAN BIOVITRUM | May 14, 2020 | AWA SWEDEN |
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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