Patent No. EP1660406 (titled "Composition Based On Cerium Oxide And On Zirconium Oxide Having A High Reducibility And Large Surface Area, Methods For The Preparation Thereof And Use As A Catalyst") was filed by Rhodia Electronics And Catalysis on Sep 2, 2004. The application was issued on Nov 14, 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.
| Company | Opposition Date | Representative |
|---|---|---|
| NEO CHEMICALS & OXIDES EUROPE | Aug 13, 2019 | 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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