Patent No. EP1817051 (titled "Pharmaceutical Compositions Comprising Botulinum Neurotoxin, A Non Ionic Surfactant, Sodium Chloride And Sucrose") was filed by Ipsen on Jul 6, 2005. The application was issued on Apr 10, 2024.

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 |
|---|---|---|
| ALLERGAN | Nov 24, 2015 | HOFFMANN EITLE |
| DAEWOONG PHARMACEUTICAL | Nov 24, 2015 | KRAUS & LEDERER PARTGMBB |
| MERZ PHARMA | Nov 20, 2015 | GRAF KEYSERLINGK |
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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