Patent No. EP2981272 (titled "Microporous Zirconium Silicate And Diuretics For The Reduction Of Potassium And Treatment Of Chronic Kidney And/Or Chronic Heart Disease") was filed by ZS Pharma on Apr 3, 2014. The application was issued on Mar 1, 2023.

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 |
|---|---|---|
| GENERICS UK | Dec 1, 2023 | ELKINGTON AND FIFE |
| TEVA PHARMACEUTICALS | Nov 22, 2023 | KRAUS & LEDERER PARTGMBB |
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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