Patent No. EP3509559 (titled "Injectable Gels Comprising Cross-Linked Hyaluronic Acid And Hydroxyapatite, And Methods Of Manufacturing Thereof") was filed by Allergan Pharmaceuticals on Sep 7, 2017. The application was issued on Jul 19, 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 |
|---|---|---|
| MERZ PHARMA | Mar 7, 2024 | WALLINGER RICKER SCHLOTTER TOSTMANN |
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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