Patent No. EP2691157 (titled "Isopentyl Esters For The Use In Cosmetic, Dermatological, Or Pharmaceutical Compositions") was filed by Evonik Degussa on Mar 27, 2012. The application was issued on Jun 7, 2023.

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 |
|---|---|---|
| KRAUS & LEDERER PARTGMBB | Mar 7, 2024 | KRAUS & LEDERER PARTGMBB |
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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