Patent No. EP3694483 (titled "Sulfate Free Clear Personal Cleansing Composition Comprising Low Inorganic Salt") was filed by The Procter & Gamble on Oct 10, 2018. The application was issued on Sep 7, 2022.
Stable sulfate-free cleansing compositions like shampoos that are clear and transparent without the use of thickeners or stabilizers. The compositions contain anionic non-sulfate surfactants, amphoteric surfactants, cationic polymers, and low levels of inorganic salt. The anionic surfactants are typically amino acid-based. The compositions are substantially free of sulfate-containing surfactants. The low inorganic salt content prevents coacervate formation during storage. Diluting the compositions with water during shampooing causes coacervate formation between the anionic and cationic components to provide wet conditioning benefits.

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 |
|---|---|---|
| INNOSPEC | Jun 7, 2023 | APPLEYARD LEES |
| UNILEVER UNILEVER | Jun 7, 2023 | MATHAI |
| L'OREAL | Jun 6, 2023 | LOREAL |
| BONIBERGER | Jun 5, 2023 | PATENT UND RECHTSANWALTE BEHRMANN WAGNER PARTG MBB |
| BEIERSDORF | May 31, 2023 | - |
| HENKEL | May 31, 2023 | - |
| KAO GERMANY | May 9, 2023 | MILLER |
| DALLI WERKE | Feb 22, 2023 | F & E 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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