Patent No. EP1641559 (titled "A Silver-Catalyst Composition, A Process For Preparing The Catalyst Composition And A Use Of The Catalyst Composition For The Epoxidation Of Ethylene") was filed by Shell Internationale Research Maatschappij on Mar 30, 2004. The application was issued on Jan 22, 2020.

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 |
|---|---|---|
| BASF | Oct 21, 2020 | REITSTOTTER KINZEBACH |
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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