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The patent EP3653645 was granted to Zoetis Services on Aug 21, 2024. The application was filed on Jul 5, 2012 under application number EP19196963A. The patent is currently recorded with a legal status of "Granted And Under Opposition".
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 | Opposition Status |
|---|---|---|---|
| MARGARET DIXON | May 21, 2025 | MEWBURN ELLIS | ADMISSIBLE |
| BOEHRINGER INGELHEIM | May 20, 2025 | D YOUNG | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2003031671 |
| DESCRIPTION | US5350576 |
| DESCRIPTION | US6194167 |
| DESCRIPTION | US6680053 |
| DESCRIPTION | US6774107 |
| DESCRIPTION | US6790639 |
| EXAMINATION | US2006141579 |
| EXAMINATION | US2007160611 |
| EXAMINATION | US7939068 |
| OPPOSITION | EP1270595 |
| OPPOSITION | EP1671642 |
| OPPOSITION | EP2644698 |
| OPPOSITION | EP2734549 |
| OPPOSITION | EP2829551 |
| OPPOSITION | EP3842456 |
| OPPOSITION | US2003224487 |
| OPPOSITION | US2006141579 |
| OPPOSITION | US2007160610 |
| OPPOSITION | US2009208494 |
| OPPOSITION | US2009220417 |
| OPPOSITION | US2009252732 |
| OPPOSITION | US2010061988 |
| OPPOSITION | US2010075996 |
| OPPOSITION | US2011106528 |
| OPPOSITION | US7939068 |
| OPPOSITION | US8133899 |
| OPPOSITION | WO03060080 |
| OPPOSITION | WO2006088956 |
| OPPOSITION | WO2006122079 |
| OPPOSITION | WO2007143231 |
| OPPOSITION | WO2011047262 |
| OTHER | EP2734539 |
| OTHER | EP2734549 |
| OTHER | WO03060080 |
| SEARCH | US2009252732 |
| SEARCH | WO2006122079 |
| SEARCH | WO2007143231 |
| SEARCH | WO2011047262 |
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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Decision to grant a European patent
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