Patent No. EP1323412 (titled "Light Screening Composition Comprising A Dibenzoylmethane Type Screening Agent And An Amino Substituted 2-Hydroxybenzophenone Derivative") was filed by L'Oreal on Nov 14, 2002. The application was issued on Oct 19, 2016.

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 |
|---|---|---|
| PLOUGMANN VINGTOFT | Jul 19, 2017 | - |
| STADA ARZNEIMITTEL | Jul 18, 2017 | HAMM&WITTKOPP PATENTANWÄLTE PARTMBB |
| BEIERSDORF | Jul 14, 2017 | - |
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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