Patent No. EP2772304 (titled "Devices For The Purification Of Nitration Products") was filed by Josef Meissner on May 18, 2012. The application was issued on Aug 7, 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 |
|---|---|---|
| NORAM | Feb 12, 2018 | M ZARDI |
| COVESTRO DEUTSCHLAND | Feb 8, 2018 | LEVPAT |
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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