Patent No. EP3253409 (titled "A Vaccine For Use Against Subclinical Lawsonia Infection In A Pig") was filed by Intervet on Feb 3, 2016. The application was issued on May 6, 2020.

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 |
|---|---|---|
| BOEHRINGER INGELHEIM | Feb 8, 2021 | VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB |
| CEVA SANTE ANIMALE | Feb 5, 2021 | CABINET BECKER ET ASSOCIES |
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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