Patent No. EP4349406 (titled "Crystalline Solid Forms Of 6-Carboxy-2-(3,5-Dichlorophenyl)-Benzoxazole For Use As A Medicament") was filed by Pfizer on Aug 31, 2015. The application was issued on Dec 3, 2025.

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 |
|---|---|---|
| GRUNECKER PATENT UND RECHTSANWALTE PARTG MBB | Sep 3, 2026 | GRUNECKER PATENT |
| HAMM&WITTKOPP PATENTANWÄLTE PARTMBB | Sep 3, 2026 | HAMM&WITTKOPP PATENTANWÄLTE PARTMBB |
| HOLLATZ | Sep 3, 2026 | TER MEER UND PARTNER |
| DEVA HOLDING | Sep 2, 2026 | - |
| QUIMICA SINTETICA | Sep 2, 2026 | BARDEHLE PAGENBERG SL |
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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