Patent No. EP1991354 (titled "Composition Based On Oxides Of Zirconium, Cerium, Yttrium, Lanthanum And Of Another Rare Earth, Method For Preparing Same And Catalytic Use") was filed by Rhodia Operations on Feb 13, 2007. The application was issued on Dec 25, 2019.

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 | Sep 24, 2020 | 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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