Patent No. EP3395338 (titled "Rapid Dissolution Formulation Of Cinacalcet Hcl") was filed by Amgen on Sep 10, 2004. The application was issued on May 1, 2019.

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 |
|---|---|---|
| BETAPHARM ARZNEIMITTEL | Dec 9, 2020 | HAMM & WITTKOPP |
| AECHTER | Jan 31, 2020 | TER MEER STEINMEISTER & PARTNER |
| BIOGARAN | Jan 31, 2020 | CASALONGA |
| HGF | Jan 31, 2020 | - |
| ACCORD HEALTHCARE | Jan 31, 2020 | TER MEER STEINMEISTER & PARTNER |
| GLENMARK PHARMACEUTICALS EUROPE | Jan 27, 2020 | SCHLICH |
| TEVA PHARMACEUTICALS | Jan 13, 2020 | 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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