Patent No. EP2160357 (titled "High Specific Surface Area Mixed Oxide Of Cerium And Of Another Rare Earth, Preparation Method And Use In Catalysis") was filed by Anan Kasei on Jun 20, 2008. The application was issued on Jul 21, 2021.

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 |
|---|---|---|
| NEO CHEMICALS & OXIDES EUROPE | Apr 20, 2022 | BIRD & BIRD |
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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