Patent No. EP3455349 (titled "Method For The Purification Of Viruses Or Virus-Like Particles Using A Crosslinked Cellulose Hydrate Membrane") was filed by Sartorius Stedim Biotech on Aug 3, 2017. The application was issued on Jun 24, 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 |
|---|---|---|
| MAX PLANCK GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV | Mar 24, 2021 | KUTTENKEULER |
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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