Patent No. EP3256574 (titled "Recombinant Adeno-Associated Virus Particle Purification Comprising An Affinity Purification Step") was filed by Association Franaise Contre LES Myopathies on Feb 9, 2016. The application was issued on Nov 25, 2020.

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 |
|---|---|---|
| EUROPEAN OPPOSITIONS | Aug 25, 2021 | SIMMONS & SIMMONS |
| J A KEMP | Aug 25, 2021 | J A KEMP |
| JAMES POOLE | Aug 25, 2021 | CARPMAELS & RANSFORD |
| JG OPPOSITIONS | Aug 25, 2021 | GREGSON |
| KONIG SZYNKA TILMANN VON RENESSE | Aug 25, 2021 | KONIG SZYNKA TILMANN VON RENESSE DUSSELDORF |
| KONIG SZYNKA TILMANN VON RENESSE | Aug 25, 2021 | KONIG SZYNKA TILMANN VON RENESSE PATENTANWALTE PARTNERSCHAFT MBB DUSSELDORF |
| DEFINITION | Aug 24, 2021 | DEFINITION |
| OETKE | Aug 24, 2021 | 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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