Patent No. EP3434265 (titled "Pharmaceutical Composition Containing Rifaximin Alpha & Delta") was filed by Sandoz on Mar 22, 2017. The application was issued on Jul 7, 2021.

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 |
|---|---|---|
| TEVA PHARMACEUTICALS | Apr 7, 2022 | D YOUNG |
| ALFRED E TIEFENBACHER | Apr 6, 2022 | HAMM & WITTKOPP |
| ALFASIGMA | Mar 21, 2022 | 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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