Patent No. EP2555981 (titled "Apparatus With Opposing Housings For Modified Atmosphere Packaging Of Products Placed In Trays") was filed by Gruppo Fabbri Vignola on Apr 4, 2011. The application was issued on Oct 9, 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 |
|---|---|---|
| MULTIVAC SEPP HAGGENMULLER | Mar 26, 2019 | GRUNECKER PATENT |
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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