Patent No. EP2760425 (titled "Foam Oxidative Hair Colorant Composition With The Free-Base Of 1, 4-Diamino-2-Methoxmethyl Benzene") was filed by Noxell on Sep 28, 2012. The application was issued on Oct 23, 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.
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.