Patent No. EP2000547 (titled "Device And Method For Sealing Or Opening An Opening, In Particular Floor Opening Of A Material Bunker For A Furnace And Furnace With Such A Device") was filed by Z&J on May 29, 2008. The application was issued on Mar 11, 2015.

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.
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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