Patent No. EP3138566 (titled "Treatment Of Phenylketonuria With Bh4") was filed by Biomarin Pharmaceutical on Nov 17, 2004. The application was issued on Jan 26, 2022.

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 |
|---|---|---|
| DIPHARMA | Oct 26, 2022 | ELKINGTON AND FIFE |
| TOBIO NOVELFARMA ILAC SAN VE TIC | Oct 12, 2022 | BULUT |
| STADA ARZNEIMITTEL | Oct 6, 2022 | HAMM & WITTKOPP |
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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