Patent No. EP1891125 (titled "Catalyst Compositions Comprising Small Silica Support Materials And Methods Of Use In Polymerization Reactions") was filed by Univation on May 26, 2006. The application was issued on Aug 13, 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 |
|---|---|---|
| INEOS EUROPE | May 13, 2015 | KING |
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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