Patent No. EP2135852 (titled "A Sealing Composition, A Method For Preparing A Sealing Composition And The Use Of Such A Sealing Composition") was filed by Bona on Jun 9, 2009. The application was issued on Jun 18, 2014.

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 |
|---|---|---|
| HENKEL | Mar 18, 2015 | - |
| UZIN UTZ AG | Mar 18, 2015 | ISARPATENT |
| WACKER CHEMIE | Mar 5, 2015 | MIESKES |
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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