Patent No. EP2833867 (titled "Solid Oral Pharmaceutical Compositions For Isoxazoline Compounds") was filed by Intervet on Apr 3, 2013. The application was issued on May 10, 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 |
|---|---|---|
| VIRBAC | Feb 16, 2018 | LAVOIX |
| BOEHRINGER INGELHEIM | Feb 16, 2018 | D YOUNG |
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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