Patent No. EP3897646 (titled "Pharmaceutical Composition For The Treatment Of Pulmonary Arterial Hypertension") was filed by Actelion Pharmaceuticals on Dec 20, 2019. The application was issued on May 22, 2024.
A combination therapy for pulmonary arterial hypertension (PAH) that targets patients with mild to moderate disease. The treatment involves administering macitentan at a high dose of 60-90 mg/day, with a preferred regimen of 75 mg/day. This combination therapy combines macitentan with phosphodiesterase type 5 inhibitors (PDE5is) and prostacyclin analogues, offering improved disease control and potential long-term benefits over traditional treatments.

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 |
|---|---|---|
| GENERICS UK | Feb 21, 2025 | ELKINGTON AND FIFE |
| SANOVEL ILAC SANAYI VE TICARET ANONIM SIRKETI | Feb 21, 2025 | SONNENHAUSER |
| SANDOZ | Feb 7, 2025 | ELKINGTON AND FIFE |
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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