Patent No. EP3856341 (titled "Crystalline Forms Of (S)-1-(4-Fluorophenyl)-1-(2-(4-(6-(1-Methyl-1H-Pyrazol-4-Yl)Pyrrolo[2,1-F][1,2,4]Triazin-4-Yl)Piperazinyl)-Pyrimidin-5-Yl)Ethan-1-Amine And Methods Of Making") was filed by Blueprint Medicines on Apr 10, 2020. The application was issued on Sep 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 | Jun 5, 2024 | TER MEER STEINMEISTER & PARTNER |
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