Patent No. EP1673332 (titled "Hydroformylation Of Butenes Comprising Isobutylene") was filed by Exxonmobil Chemical Patents on Sep 17, 2004. The application was issued on Jun 17, 2015.

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 | Mar 17, 2016 | BASF ASSOCIATION |
| EVONIK OPERATIONS | Mar 17, 2016 | EISENFUHR SPEISER |
| JOHNSON MATTHEY DAVY | Oct 21, 2015 | BOWN |
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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