Patent No. EP3395340 (titled "Rapid Dissolution Formulation Of Cinacalcet Hcl") was filed by Amgen on Sep 10, 2004. The application was issued on Dec 11, 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 |
|---|---|---|
| AECHTER | Jan 17, 2020 | TER MEER STEINMEISTER & PARTNER |
| BIOGARAN | Jan 17, 2020 | CASALONGA |
| HGF | Jan 17, 2020 | - |
| MAIWALD | Jan 17, 2020 | - |
| ACCORD HEALTHCARE | Jan 17, 2020 | TER MEER STEINMEISTER & PARTNER |
| GILLARD | Jan 16, 2020 | ELKINGTON AND FIFE |
| GLENMARK PHARMACEUTICALS EUROPE | Jan 16, 2020 | SCHLICH |
| HAMM & WITTKOPP | Jan 16, 2020 | - |
| 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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