Patent No. EP3653645 (titled "Interleukin-31 Monoclonal Antibody") was filed by Zoetis Services on Jul 5, 2012. The application was issued on Aug 21, 2024.
Anti-IL-31 antibodies for treating pruritic conditions in dogs and cats, comprising a variable light chain and a variable heavy chain, and variants thereof with conservative amino acid substitutions. The antibodies specifically bind to canine IL-31, inhibit its activity, and prevent its binding to the IL-31 receptor complex. The antibodies are useful for treating conditions such as atopic dermatitis, eczema, and pruritus in dogs and cats.

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 |
|---|---|---|
| MARGARET DIXON | May 21, 2025 | MEWBURN ELLIS |
| BOEHRINGER INGELHEIM | May 20, 2025 | 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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