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Patent No. EP3233258 (titled "Two-Component Products In Bags For The Oxidative Dyeing Of Keratin Fibres") was filed by Henkel on Nov 17, 2015. The application was issued on Sep 9, 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 |
|---|---|---|
| HAMMER | Jun 9, 2021 | GRUNECKER PATENT |
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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