Patent No. EP3313408 (titled "Drospirenone-Based Contraceptive For A Female Patient Affected With Excess Weight") was filed by Laboratorios Leon Farma on Jun 23, 2016. The application was issued on Dec 6, 2023.

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 |
|---|---|---|
| TER MEER STEINMEISTER & PARTNER PATENTANWALTE MBB | Sep 5, 2024 | TER MEER STEINMEISTER & PARTNER |
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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