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The patent EP4252857 was granted to Regeneron Pharmaceuticals on Sep 25, 2024. The application was originally filed on Sep 12, 2012 under application number EP23176223A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

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.
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2010166768 |
| DESCRIPTION | US6596541 |
| OPPOSITION | EP2756004 |
| OPPOSITION | EP3536712 |
| OPPOSITION | US2010166768 |
| OPPOSITION | WO2009026558 |
| OPPOSITION | WO2010077854 |
| OPPOSITION | WO2012154999 |
| OPPOSITION | WO2013016648 |
| OPPOSITION | WO2015054619 |
| SEARCH | WO2011028938 |
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
Search/Exam
Aug 16, 2024
(Electronic) Receipt
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Aug 16, 2024
Filing of the translations of the claims
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Aug 16, 2024
French translation of claims
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Aug 16, 2024
German translation of the claims
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Aug 16, 2024
Letter accompanying subsequently filed items
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Intention to grant (signatures)
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Jul 31, 2024
Text intended for grant (clean copy)
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Jul 16, 2024
Examination started
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(Electronic) Receipt
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Amended claims with annotations
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Amended description with annotations
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Amendments received before examination
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Jun 6, 2024
Letter accompanying subsequently filed items
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Refund of fees
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European search opinion
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Nov 8, 2023
European search report
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Nov 8, 2023
Information on Search Strategy
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Oct 18, 2023
Search started
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Sep 6, 2023
Notification of forthcoming publication
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Aug 24, 2023
(Electronic) Receipt
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Aug 24, 2023
Claims
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Aug 24, 2023
Letter accompanying subsequently filed items
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Aug 24, 2023
Letter concerning search matters
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Jun 15, 2023
Invitation to file claims
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May 30, 2023
Abstract
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May 30, 2023
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Converted Sequence Listing
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May 30, 2023
Description
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May 30, 2023
Designation of inventor
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May 30, 2023
Letter concerning search matters
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May 30, 2023
Request for grant of a European patent
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