Patent No. EP3127551 (titled "Use Of A Pcv2 Immunogenic Composition For Lessening Clinical Symptoms In Pigs") was filed by Boehringer Ingelheim on Dec 28, 2006. The application was issued on Jul 29, 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 |
|---|---|---|
| ELANCO | Apr 29, 2021 | POTTER CLARKSON |
| CEVA SANTE ANIMALE | Apr 27, 2021 | CABINET BECKER ET ASSOCIES |
| LABORATORIOS HIPRA | Sep 15, 2020 | GRUNECKER PATENT |
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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