Patent No. EP2766322 (titled "Use Of Unfired Refractory Products As A Lining In Large-Volume Industrial Furnaces, As Well As An Industrial Furnace Lined With Said Unfired Refractory Products") was filed by Refratechnik Holding GmbH on Nov 26, 2013. The application was issued on Feb 15, 2017.

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 |
|---|---|---|
| REFRACTORY INTELLECTUAL PROPERTY GMBH & CO. KG | Nov 14, 2017 | BERKENBRINK |
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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