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The patent EP3505751 was granted to Vestas Wind Systems on Mar 24, 2021. The application was filed on Dec 11, 2012 under application number EP19156353A. 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.
| Company | Opposition Date | Representative | Opposition Status |
|---|---|---|---|
| SIEMENS GAMESA RENEWABLE ENERGY | Dec 23, 2021 | SGRE ASSOCIATION | ADMISSIBLE |
| SIEMENS GAMESA RENEWABLE ENERGY DEUTSCHLAND | Dec 23, 2021 | SGRE ASSOCIATION | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| OPPOSITION | EP1520983 |
| OPPOSITION | EP2497945 |
| OPPOSITION | EP3505751 |
| OPPOSITION | GB2497578 |
| OPPOSITION | US2008145615 |
| OPPOSITION | US2008277053 |
| OPPOSITION | US2009169392 |
| OPPOSITION | US2009220747 |
| OPPOSITION | US2010143142 |
| OPPOSITION | US2011084496 |
| OPPOSITION | US2011135485 |
| OPPOSITION | US2012027609 |
| OPPOSITION | US2012093656 |
| OPPOSITION | US7841835 |
| OPPOSITION | WO2006082479 |
| OPPOSITION | WO2009059604 |
| OPPOSITION | WO2011088372 |
| OPPOSITION | WO2011135306 |
| SEARCH | US2008145615 |
| SEARCH | US2008277053 |
| SEARCH | US2011084496 |
| SEARCH | WO2009059604 |
| SEARCH | WO2011088372 |
| SEARCH | WO2011135306 |
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.
Date
Description
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Sep 10, 2025
Sep 5, 2025
(Electronic) Receipt
Appeal
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Reply to appeal
Appeal
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Appeal
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Appeal
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Notice of appeal
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Appeal
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Authorisation
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Decision to grant a European patent
Search/Exam
Feb 16, 2021
(Electronic) Receipt
Search/Exam
Feb 16, 2021
Filing of the translations of the claims
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Feb 16, 2021
French translation of claims
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Feb 16, 2021
German translation of the claims
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Feb 16, 2021
Letter accompanying subsequently filed items
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Intention to grant (signatures)
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Oct 21, 2020
Text intended for grant (clean copy)
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Sep 25, 2020
(Electronic) Receipt
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Sep 25, 2020
Amended claims with annotations
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Amended description with annotations
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Claims
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Description
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Letter accompanying subsequently filed items
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Intention to grant (signatures)
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(Electronic) Receipt
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Amended claims with annotations
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Dec 23, 2019
Letter accompanying subsequently filed items
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Refund of fees
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European search opinion
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European search report
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Jun 5, 2019
Information on Search Strategy
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Jun 5, 2019
Notification of forthcoming publication
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May 27, 2019
Search started
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Apr 5, 2019
Communication to designated inventor
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Communication to designated inventor
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Communication to designated inventor
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Feb 11, 2019
Abstract
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Feb 11, 2019
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Claims
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Feb 11, 2019
Description
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Feb 11, 2019
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Feb 11, 2019
Request for grant of a European patent
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Jul 11, 2013
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