Patent No. EP2989138 (titled "Urethane Acrylates Based On 2,4,8,10-Tetraoxospiro[5.5]Undecane-3,9-Dialkanols") was filed by Perstorp on Mar 11, 2014. The application was issued on Aug 1, 2018.

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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