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Patent No. EP3977993 (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 Jan 31, 2024.

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 |
|---|---|---|
| KELTIE | Oct 31, 2024 | KELTIE |
| QUIMICA SINTETICA | Oct 29, 2024 | AERA |
| QUIMICA SINTETICA | Oct 29, 2024 | 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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