Patent No. EP3111916 (titled "Use Of Charged Surfactants For Reducing Textile Staining By Antiperspirants") was filed by Beiersdorf on Feb 24, 2010. The application was issued on Apr 2, 2025.

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 |
|---|---|---|
| HENKEL | Jan 22, 2021 | - |
| UNILEVER UNILEVER | Jan 22, 2021 | WHALEY |
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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